Revert "[TSAN] Add __tsan_check_no_mutexes_held helper (#69372)"

The new lit test fails, see comment on the PR. This also reverts
the follow-up commit, see below.

> This adds a new helper that can be called from application code to
> ensure that no mutexes are held on specific code paths. This is useful
> for multiple scenarios, including ensuring no locks are held:
>
> - at thread exit
> - in peformance-critical code
> - when a coroutine is suspended (can cause deadlocks)
>
> See this discourse thread for more discussion:
>
> https://discourse.llvm.org/t/add-threadsanitizer-check-to-prevent-coroutine-suspending-while-holding-a-lock-potential-deadlock/74051

This reverts commit bd841111.
This reverts commit 16a395b7.