Revert "Prevent starvation when acquiring mutex over and over (#15877)" (#15990)HEADmaster

This reverts commit 994257ab06072df38de024e70a60aa9a87e36089.

I saw some failures in CI that are probably related to the change.
Example:

```
 1) Failure:
  TestMonitor#test_timedwait [/Users/runner/work/ruby/ruby/src/test/monitor/test_monitor.rb:282]:
```

This starvation problem has not been an issue in real apps afaik, so for now it's best to revert
it and think of a better solution.

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