Only print evaluate requests in REPL context (#1334)

This PR fixes the EvaluateRequest with an -exec command and assign the return protocol with the correct Value.

This causes the DebugConsole in VS Code to show the output as a REPL output (gray) instead of an engine output (blue).

src/MIDebugEngine/Engine.Impl/Variables.cs

@@ -524,13 +524,8 @@ internal async Task Eval(uint radix, enum_EVALFLAGS dwFlags = 0, DAPEvalFlags dw
                     string consoleResults = null;
 
                     consoleResults = await MIDebugCommandDispatcher.ExecuteCommand(consoleCommand, _debuggedProcess, ignoreFailures: true);
-                    Value = String.Empty;
+                    Value = consoleResults;
                     this.TypeName = null;
-
-                    if (!String.IsNullOrEmpty(consoleResults))
-                    {
-                        _debuggedProcess.WriteOutput(consoleResults);
-                    }
                 }
                 else
                 {