[wasm][debugger] Never send messages from our internal protocol extensions to the browser (#77616)

* ignore messages from protocol extensions even for unknown context

* Addressing @radical comments

* adressing @radical comments

* adressing @radical comments

Author: thaystg

src/mono/wasm/debugger/BrowserDebugProxy/MonoProxy.cs

@@ -267,7 +267,8 @@ protected override async Task<bool> AcceptCommand(MessageId id, JObject parms, C
                     if (pauseOnException != PauseOnExceptionsKind.Unset)
                         _defaultPauseOnExceptions = pauseOnException;
                 }
-                return false;
+                // for Dotnetdebugger.* messages, treat them as handled, thus not passing them on to the browser
+                return method.StartsWith("DotnetDebugger.", StringComparison.OrdinalIgnoreCase);
             }
 
             switch (method)
@@ -566,8 +567,8 @@ protected override async Task<bool> AcceptCommand(MessageId id, JObject parms, C
                         }
                     }
             }
-
-            return false;
+            // for Dotnetdebugger.* messages, treat them as handled, thus not passing them on to the browser
+            return method.StartsWith("DotnetDebugger.", StringComparison.OrdinalIgnoreCase);
         }
 
         private async Task<bool> ApplyUpdates(MessageId id, JObject args, CancellationToken token)