[HLT] Add PWM tests that use DMA as the back end (#3447)

Both a decent DMA test, and slightly more reliable PWM test.

crossConnIntegrationTests/src/main/native/cpp/TestEnvironment.cpp

@@ -61,6 +61,7 @@ class TestEnvironment : public testing::Environment {
 
       fmt::print("Waiting for enable: {}\n", enableCounter++);
     }
+    std::this_thread::sleep_for(500ms);
   }
 
   ~TestEnvironment() override { m_mockDS.Stop(); }