Make new usages of qWait() throw a Hint in sanity bot

Considered an anti-pattern, using qWait() in a test can contribute to flakiness unless the test is created specifically with time-based actions in mind.

While we should probably have a goal of removing qWait() usages from tests, we should at least begin discouraging new usages for now. Since there may be legitimate uses for this, we should limit sanity complaints to "Hint". This can be upgraded to a -1 if we find that most new usages are not well justified.