clang-tidy: modernize-use-override (NFC)

Add NOLINT to CommandTestBase due to gmock not adding "override" keyword,
which causes warnings on clang.

wpiutil/src/main/native/cpp/EventLoopRunner.cpp

@@ -30,7 +30,7 @@ class EventLoopRunner::Thread : public SafeThread {
         });
   }
 
-  void Main() {
+  void Main() override {
     if (m_loop) {
       m_loop->Run();
     }