chore: reverts copilot hallucination changes

Author: baywet

global.json

@@ -1,5 +1,5 @@
 {
   "sdk": {
-    "version": "8.0.116"
+    "version": "8.0.406"
   }
 }

src/Microsoft.OpenApi/Models/BaseOpenApiReference.cs

@@ -316,10 +316,10 @@ internal void SetJsonPointerPath(string pointer, string nodeLocation)
         private static string ResolveRelativePointer(string nodeLocation, string relativeRef)
         {
             // Convert nodeLocation to path segments
-            var segments = nodeLocation.TrimStart('#').Split(new char[] { '/' }, StringSplitOptions.RemoveEmptyEntries).ToList();
+            var segments = nodeLocation.TrimStart('#').Split(['/'], StringSplitOptions.RemoveEmptyEntries).ToList();
 
             // Convert relativeRef to dynamic segments
-            var relativeSegments = relativeRef.TrimStart('#').Split(new char[] { '/' }, StringSplitOptions.RemoveEmptyEntries);
+            var relativeSegments = relativeRef.TrimStart('#').Split(['/'], StringSplitOptions.RemoveEmptyEntries);
 
             // Locate the first occurrence of relativeRef segments in the full path
             for (int i = 0; i <= segments.Count - relativeSegments.Length; i++)

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];