Properly await for terminated processes#5

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jprotopopov-ut wants to merge 3 commits intosim642:masterfrom

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Commits on Aug 12, 2025

Await for all sanitizer subprocesses to terminate before closing the event loop. Fixes 'Event loop is closed' runtime error in BaseSubprocessTransport destructors
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Ignore ProcessLookupError which rarely arises upon sending SIGKILL upon process that has already been awaited
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Commits on Aug 14, 2025

Add --timeout parameter to terminate all sanitizer processes after specified time reporting that no races were found
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