Fix KeyguardTransitionRepository tests

I previously changed the log level on this in ag/27069661 as I thought
that this is a possible scenario that we should warn about but several
scenarios are possible where I would not consider this a error/failure.

For example any component that might update a manual transition could
attempt to do so right after some other component started a new
transition with `startTransition()` above. This would invalidate the
UUID but in my opinion just ignoring the update is fine. We should warn
about it so potential bugs resulting from this can be noted but I would
expect the system to continue to behave fine.

However, this made KeyguardTransitionRepositoryTests fail that I was not
aware of because the entire class is marked as flaky.

We can solve this either by changing back to wtf or removing/adjusting
the tests.

Bug: 341261406
Test: TEST_ONLY
Flag: TEST_ONLY
Change-Id: I017aac3845df5e4b2557d8b36dfadffe723ecf5e