C#: Fix warnings caught by new problem-matchers

[Repiteo]

• Related CI: Add explicit problem matchers #99770

The above PR integrated specialized problem matchers for our repo, serving as enhanced versions of the ones we were already using. One consequence of this addition was the .NET solutions started to produce warnings as well, so those specific matchers needed to be excluded so they wouldn't create noise on all Actions post-merge. This PR fixes the handful of remaining warnings throughout the C# codebase, allowing that exclusion to be removed so future C# errors/warnings will be caught by GitHub Actions

[raulsntos]

Seems fine. I checked the generated bindings and these were the only changes:

diff --git a/GodotSharp/GodotObjects/EngineDebugger.cs b/GodotSharp/GodotObjects/EngineDebugger.cs
index 8fe54b1..b61f089 100644
--- a/GodotSharp/GodotObjects/EngineDebugger.cs
+++ b/GodotSharp/GodotObjects/EngineDebugger.cs
@@ -101,7 +101,7 @@ public static partial class EngineDebugger
     /// <summary>
     /// <para>Registers a message capture with given <paramref name="name"/>. If <paramref name="name"/> is "my_message" then messages starting with "my_message:" will be called with the given callable.</para>
     /// <para>The callable must accept a message string and a data array as argument. The callable should return <see langword="true"/> if the message is recognized.</para>
-    /// <para><b>Note:</b> The callable will receive the message with the prefix stripped, unlike <see cref="Godot.EditorDebuggerPlugin._Capture(string, Godot.Collections.Array, int)"/>. See the <c>EditorDebuggerPlugin</c> description for an example.</para>
+    /// <para><b>Note:</b> The callable will receive the message with the prefix stripped, unlike <c>EditorDebuggerPlugin._Capture</c>. See the <c>EditorDebuggerPlugin</c> description for an example.</para>
     /// </summary>
     public static void RegisterMessageCapture(StringName name, Callable callable)
     {
diff --git a/GodotSharp/GodotObjects/EngineDebuggerInstance.cs b/GodotSharp/GodotObjects/EngineDebuggerInstance.cs
index e52d2f6..b16c9c4 100644
--- a/GodotSharp/GodotObjects/EngineDebuggerInstance.cs
+++ b/GodotSharp/GodotObjects/EngineDebuggerInstance.cs
@@ -118,7 +118,7 @@ public partial class EngineDebuggerInstance : GodotObject
     /// <summary>
     /// <para>Registers a message capture with given <paramref name="name"/>. If <paramref name="name"/> is "my_message" then messages starting with "my_message:" will be called with the given callable.</para>
     /// <para>The callable must accept a message string and a data array as argument. The callable should return <see langword="true"/> if the message is recognized.</para>
-    /// <para><b>Note:</b> The callable will receive the message with the prefix stripped, unlike <see cref="Godot.EditorDebuggerPlugin._Capture(string, Godot.Collections.Array, int)"/>. See the <c>EditorDebuggerPlugin</c> description for an example.</para>
+    /// <para><b>Note:</b> The callable will receive the message with the prefix stripped, unlike <c>EditorDebuggerPlugin._Capture</c>. See the <c>EditorDebuggerPlugin</c> description for an example.</para>
     /// </summary>
     public void RegisterMessageCapture(StringName name, Callable callable)
     {
diff --git a/GodotSharp/GodotObjects/GltfAccessor.cs b/GodotSharp/GodotObjects/GltfAccessor.cs
index 15ab651..27b543f 100644
--- a/GodotSharp/GodotObjects/GltfAccessor.cs
+++ b/GodotSharp/GodotObjects/GltfAccessor.cs
@@ -461,7 +461,7 @@ public partial class GltfAccessor : Resource
     private static readonly IntPtr MethodBind12 = ClassDB_get_method_with_compatibility(NativeName, MethodName.GetType, 2455072627ul);
 
     [EditorBrowsable(EditorBrowsableState.Never)]
-    public int GetType()
+    public new int GetType()
     {
         return NativeCalls.godot_icall_0_37(MethodBind12, GodotObject.GetPtr(this));
     }
@@ -793,7 +793,7 @@ public partial class GltfAccessor : Resource
         /// <summary>
         /// Cached name for the 'get_type' method.
         /// </summary>
-        public static readonly StringName GetType = "get_type";
+        public static new readonly StringName GetType = "get_type";
         /// <summary>
         /// Cached name for the 'set_type' method.
         /// </summary>
diff --git a/GodotSharp/GodotObjects/VisualShaderNodeReroute.cs b/GodotSharp/GodotObjects/VisualShaderNodeReroute.cs
index a1c19f1..537edda 100644
--- a/GodotSharp/GodotObjects/VisualShaderNodeReroute.cs
+++ b/GodotSharp/GodotObjects/VisualShaderNodeReroute.cs
@@ -12,7 +12,7 @@ using Godot.NativeInterop;
 public partial class VisualShaderNodeReroute : VisualShaderNode
 {
     [EditorBrowsable(EditorBrowsableState.Never)]
-    public VisualShaderNode.PortType PortType
+    public new VisualShaderNode.PortType PortType
     {
         get
         {