Better align shutdown semantics of testing event loops #203

Job	Run time
Checks / Integration Tests / 5.8	12m 55s
Checks / Integration Tests / 5.9	14m 32s
Soundness / API breakage check	2m 29s
Soundness / Broken symlinks check	7s
Checks / Integration Tests / 5.10	14m 4s
Soundness / Documentation check	1m 58s
Checks / Integration Tests / nightly-6.0	16m 47s
Soundness / Format check	53s
Soundness / License headers check	9s
Checks / Integration Tests / nightly-main	18m 3s
Soundness / Unacceptable language check	3s
Checks / Unit tests / 5.8	3m 18s
Checks / Unit tests / 5.9	3m 17s
Checks / Unit tests / 5.10	3m 17s
Checks / Unit tests / nightly-6.0	4m 15s
Checks / Unit tests / nightly-main	4m 8s
Checks / Cxx interop / 5.8	58s
Checks / Cxx interop / 5.9	1m 12s
Checks / Cxx interop / 5.10	1m 3s
Checks / Cxx interop / nightly-6.0	1m 44s
Checks / Benchmarks / 5.8	2m 38s
Checks / Cxx interop / nightly-main	1m 47s
Checks / Benchmarks / 5.9	3m 49s
Checks / Benchmarks / 5.10	3m 46s
Checks / Benchmarks / nightly-6.0	4m 32s
Checks / Benchmarks / nightly-main	4m 40s
	2h 6m 24s

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