bugfix: Only delete directories if nothing is running #2822
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Previously, we would sometimes delete directories when another compilation was running concurrently. Now, we only delete at the end if no other compilation is running.
Should fix #2779
@jackkoenig It took longer than I wanted, since I tried adding tests for this. However, it seems that the tests pass even I remove the old deletion mechanism, which seems impossible. Testing manually confirms that this works, but I think I might need some additional testing suite at some point to simulate better actual client such as Metals. Since, this already took longer than I wanted, I'll merge this and you can confirm if there are any issues with this new approach.