Fix test_process_executor_kills_process flakyness #5183
Merged
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test_process_executor_kills_process has started chain-failing on ubuntu 3.7/3.8/3.9 and on macosx 3.7 (only).
Possibly it's not failing on macosx 3.8/3.9 because the scheduler is not cythonized and that's enough to slow everything down to let the SIGTERM take effect?
This PR changes SIGTERM to SIGKILL which should be instantaneous at all times.
Also address a couple other flaky tests.