Cleanup CurrentTestApplicationModuleInfo (#7693)

Author: Youssef1313

src/Platform/Microsoft.Testing.Platform/Services/CurrentTestApplicationModuleInfo.cs

@@ -37,6 +37,8 @@ public bool IsCurrentTestApplicationModuleExecutable
         get
         {
             string? processPath = GetProcessPath(_environment, _process, true);
+            // TODO: Looks like this will always be true.
+            // Investigate if we have a bug here.
             return processPath != ".dll";
         }
     }
@@ -113,16 +115,13 @@ public ExecutableInfo GetCurrentExecutableInfo()
     {
         bool isDotnetMuxer = IsCurrentTestApplicationHostDotnetMuxer;
         bool isAppHost = IsAppHostOrSingleFileOrNativeAot;
-        bool isMonoMuxer = IsCurrentTestApplicationHostMonoMuxer;
         string[] commandLineArguments = _environment.GetCommandLineArgs();
-        IEnumerable<string> arguments = (isAppHost, isDotnetMuxer, isMonoMuxer) switch
+        IEnumerable<string> arguments = (isAppHost, isDotnetMuxer) switch
         {
             // When executable
-            (true, _, _) => commandLineArguments.Skip(1),
+            (true, _) => commandLineArguments.Skip(1),
             // When dotnet
-            (_, true, _) => MuxerExec.Concat(commandLineArguments),
-            // When mono
-            (_, _, true) => commandLineArguments,
+            (_, true) => MuxerExec.Concat(commandLineArguments),
             // Otherwise
             _ => commandLineArguments,
         };