Checks `subtreeFlags` before scheduling an effect on the Profiler.

The change to conditionally call Profiler commit hooks only if updates were scheduled broke a few of the Profiler tests. I've fixed the tests by either:
* Adding a no-op passive effect into the subtree or
* Converting onPostCommit to onCommit

When possible, I opted to add the no-op passive effect to the tests since that that hook is called later (during passive phase) so the test is a little broader. In a few cases, this required adding awkward act() wrappers so I opted to go with onCommit instead.