Fix double spacing in ClientUriBuilder generated code (#8971)

`BinaryOperatorExpression.Write()` adds spaces around operators during
code generation. `ClientUriBuilderDefinition` was passing operators with
embedded spaces (`" - "`, `" + "`, `" ??= "`), causing double spacing in
generated output.

**Changes:**
- Remove spaces from operator strings in `ClientUriBuilderDefinition.cs`
to match codebase convention

**Before:**
```csharp
private UriBuilder UriBuilder => _uriBuilder  ??=  new UriBuilder();
if (_pathLength > 0 && PathAndQuery[_pathLength  -  1] == '/')
```

**After:**
```csharp
private UriBuilder UriBuilder => _uriBuilder ??= new UriBuilder();
if (_pathLength > 0 && PathAndQuery[_pathLength - 1] == '/')
```

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<details>

<summary>Original prompt</summary>

> 
> ----
> 
> *This section details on the original issue you should resolve*
> 
> <issue_title>Inconsistent spacing in ClientUriBuilder</issue_title>
>
<issue_description>https://github.com/Azure/azure-sdk-for-net/pull/53776#discussion_r2505733548</issue_description>
> 
> ## Comments on the Issue (you are @copilot in this section)
> 
> <comments>
> </comments>
> 


</details>

- Fixes #8959

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---------

Co-authored-by: copilot-swe-agent[bot] <[email protected]>
Co-authored-by: JoshLove-msft <[email protected]>

Author: Copilot

packages/http-client-csharp/generator/Microsoft.TypeSpec.Generator.ClientModel/src/Providers/ClientUriBuilderDefinition.cs

@@ -33,7 +33,7 @@ internal sealed class ClientUriBuilderDefinition : TypeProvider
             modifiers: MethodSignatureModifiers.Private,
             name: "UriBuilder",
             type: typeof(UriBuilder),
-            body: new ExpressionPropertyBody(new BinaryOperatorExpression(" ??= ", _uriBuilderField, New.Instance(typeof(UriBuilder)))),
+            body: new ExpressionPropertyBody(new BinaryOperatorExpression("??=", _uriBuilderField, New.Instance(typeof(UriBuilder)))),
             description: null,
             enclosingType: this);
 
@@ -51,7 +51,7 @@ internal sealed class ClientUriBuilderDefinition : TypeProvider
             modifiers: MethodSignatureModifiers.Private,
             name: "PathAndQuery",
             type: typeof(StringBuilder),
-            body: new ExpressionPropertyBody(new BinaryOperatorExpression(" ??= ", _pathAndQueryField, New.Instance(typeof(StringBuilder)))),
+            body: new ExpressionPropertyBody(new BinaryOperatorExpression("??=", _pathAndQueryField, New.Instance(typeof(StringBuilder)))),
             description: null,
             enclosingType: this);
 
@@ -153,14 +153,14 @@ private MethodProvider[] BuildAppendPathMethods()
                 },
                 MethodBodyStatement.Empty,
                 // Check for double slashes: if path ends with '/' and value starts with '/'
-                new IfStatement(pathLength.GreaterThan(Int(0)).And(stringBuilder.Index(new BinaryOperatorExpression(" - ", pathLength, Int(1))).Equal(Literal('/'))).And(valueParameter.As<string>().Index(Int(0)).Equal(Literal('/'))))
+                new IfStatement(pathLength.GreaterThan(Int(0)).And(stringBuilder.Index(new BinaryOperatorExpression("-", pathLength, Int(1))).Equal(Literal('/'))).And(valueParameter.As<string>().Index(Int(0)).Equal(Literal('/'))))
                 {
-                    stringBuilder.Remove(new BinaryOperatorExpression(" - ", pathLength, Int(1)), Int(1)).Terminate(),
-                    _pathLengthField.Assign(new BinaryOperatorExpression(" - ", pathLength, Int(1))).Terminate()
+                    stringBuilder.Remove(new BinaryOperatorExpression("-", pathLength, Int(1)), Int(1)).Terminate(),
+                    _pathLengthField.Assign(new BinaryOperatorExpression("-", pathLength, Int(1))).Terminate()
                 },
                 MethodBodyStatement.Empty,
                 stringBuilder.Invoke("Insert", [pathLength, valueParameter]).Terminate(),
-                _pathLengthField.Assign(new BinaryOperatorExpression(" + ", pathLength, valueParameter.As<string>().Length())).Terminate()
+                _pathLengthField.Assign(new BinaryOperatorExpression("+", pathLength, valueParameter.As<string>().Length())).Terminate()
             };
 
             return
@@ -222,7 +222,7 @@ private MethodProvider[] BuildAppendQueryMethods()
                 {
                     stringBuilder.Append(Literal('?')).Terminate()
                 },
-                new IfStatement(stringBuilder.Length().GreaterThan(pathLength).And(stringBuilder.Index(new BinaryOperatorExpression(" - ", stringBuilder.Length(), Int(1))).NotEqual(Literal('?'))))
+                new IfStatement(stringBuilder.Length().GreaterThan(pathLength).And(stringBuilder.Index(new BinaryOperatorExpression("-", stringBuilder.Length(), Int(1))).NotEqual(Literal('?'))))
                 {
                     stringBuilder.Append(Literal('&')).Terminate()
                 },
@@ -353,7 +353,7 @@ private MethodProvider BuildToUriMethod()
                 // Set the query portion if it exists
                 new IfStatement(stringBuilder.Length().GreaterThan(pathLength))
                 {
-                    UriBuilderQuery.Assign(stringBuilder.Invoke("ToString", [new BinaryOperatorExpression(" + ", pathLength, Int(1)), new BinaryOperatorExpression(" - ", new BinaryOperatorExpression(" - ", stringBuilder.Length(), pathLength), Int(1))])).Terminate()
+                    UriBuilderQuery.Assign(stringBuilder.Invoke("ToString", [new BinaryOperatorExpression("+", pathLength, Int(1)), new BinaryOperatorExpression("-", new BinaryOperatorExpression("-", stringBuilder.Length(), pathLength), Int(1))])).Terminate()
                 },
                 new IfStatement(stringBuilder.Length().Equal(pathLength))
                 {

packages/http-client-csharp/generator/TestProjects/Local/Sample-TypeSpec/src/Generated/Internal/ClientUriBuilder.cs

@@ -22,9 +22,9 @@ public ClientUriBuilder()
         {
         }
 
-        private UriBuilder UriBuilder => _uriBuilder  ??=  new UriBuilder();
+        private UriBuilder UriBuilder => _uriBuilder ??= new UriBuilder();
 
-        private StringBuilder PathAndQuery => _pathAndQuery  ??=  new StringBuilder();
+        private StringBuilder PathAndQuery => _pathAndQuery ??= new StringBuilder();
 
         public void Reset(Uri uri)
         {
@@ -40,13 +40,13 @@ public void AppendPath(string value, bool escape)
             {
                 value = Uri.EscapeDataString(value);
             }
-            if (_pathLength > 0 && PathAndQuery[_pathLength  -  1] == '/' && value[0] == '/')
+            if (_pathLength > 0 && PathAndQuery[_pathLength - 1] == '/' && value[0] == '/')
             {
-                PathAndQuery.Remove(_pathLength  -  1, 1);
-                _pathLength = _pathLength  -  1;
+                PathAndQuery.Remove(_pathLength - 1, 1);
+                _pathLength = _pathLength - 1;
             }
             PathAndQuery.Insert(_pathLength, value);
-            _pathLength = _pathLength  +  value.Length;
+            _pathLength = _pathLength + value.Length;
         }
 
         public void AppendPath(bool value, bool escape = false) => AppendPath(TypeFormatters.ConvertToString(value), escape);
@@ -80,7 +80,7 @@ public void AppendQuery(string name, string value, bool escape)
             {
                 PathAndQuery.Append('?');
             }
-            if (PathAndQuery.Length > _pathLength && PathAndQuery[PathAndQuery.Length  -  1] != '?')
+            if (PathAndQuery.Length > _pathLength && PathAndQuery[PathAndQuery.Length - 1] != '?')
             {
                 PathAndQuery.Append('&');
             }
@@ -127,7 +127,7 @@ public Uri ToUri()
             UriBuilder.Path = PathAndQuery.ToString(0, _pathLength);
             if (PathAndQuery.Length > _pathLength)
             {
-                UriBuilder.Query = PathAndQuery.ToString(_pathLength  +  1, PathAndQuery.Length  -  _pathLength  -  1);
+                UriBuilder.Query = PathAndQuery.ToString(_pathLength + 1, PathAndQuery.Length - _pathLength - 1);
             }
             if (PathAndQuery.Length == _pathLength)
             {