Fix memory leaks & data races in tests (#4772)

* Add a few pre-made sanitizer suppressions

* Test Sanitization: Fix threading issues

* Test Sanitization: Allow deletion of PubSub

We still don't delete it in main code, but this allows us to try
deleting it in tests.

* Test Sanitization: Fix some memory leaks

* fix gtest clang-tidy warning

* const emojis test :-)

src/providers/twitch/PubSubActions.hpp

@@ -33,6 +33,7 @@ inline QDebug operator<<(QDebug dbg, const ActionUser &user)
 }
 
 struct PubSubAction {
+    PubSubAction() = default;
     PubSubAction(const QJsonObject &data, const QString &_roomID);
     ActionUser source;