Jean Boussier 268269687c thread/test_instrumentation_api: cleanup all existing threads in setup
We saw the following failure:
```
TestThreadInstrumentation#test_thread_instrumentation [/tmp/ruby/v3/src/trunk-random3/test/-ext-/thread/test_instrumentation_api.rb:25]:
Expected 0..3 to include 4.
```

Which shouldn't happen unless somehow there was a leaked thread.
2022-07-13 14:13:41 +02:00
..
2022-06-06 18:13:01 +09:00
2022-07-10 23:10:36 -07:00
2022-05-20 17:49:15 +09:00