chore: reverts useless changes from copilot

Author: baywet

src/Microsoft.OpenApi/Models/OpenApiDocument.cs

@@ -589,7 +589,7 @@ private static string ConvertByteArrayToString(byte[] hash)
                     // Enables setting the complete JSON path for nested subschemas e.g. #/components/schemas/person/properties/address
                     if (useExternal)
                     {
-                        var relPathSegment = referenceV3.Split(new char[] {'#'}, StringSplitOptions.RemoveEmptyEntries)[1];
+                        var relPathSegment = referenceV3.Split(['#'], StringSplitOptions.RemoveEmptyEntries)[1];
                         relativePath = $"#{relPathSegment}";
                     }
                     else
@@ -625,7 +625,7 @@ private static bool IsSubComponent(string reference)
 
             if (fragment.StartsWith("/components/schemas/", StringComparison.OrdinalIgnoreCase))
             {
-                var segments = fragment.Split(new char[] {'/'}, StringSplitOptions.RemoveEmptyEntries);
+                var segments = fragment.Split(['/'], StringSplitOptions.RemoveEmptyEntries);
 
                 // Expect exactly 3 segments for root-level schema: ["components", "schemas", "person"]
                 // Anything longer means it's a subcomponent.

src/Microsoft.OpenApi/Services/OpenApiWorkspace.cs

@@ -347,7 +347,7 @@ public bool Contains(string location)
 
             if (uri is not null)
             {
-                pathSegments = uri.Fragment.Split(new char[] {'/'}, StringSplitOptions.RemoveEmptyEntries);
+                pathSegments = uri.Fragment.Split(['/'], StringSplitOptions.RemoveEmptyEntries);
 
                 // Build the base path for the root schema: "#/components/schemas/person"
                 var fragment = OpenApiConstants.ComponentsSegment + ReferenceType.Schema.GetDisplayName() + ComponentSegmentSeparator + pathSegments[3];