Share one event loop per test module to stop Windows socketpair churn… #3406

Job	Run time
checks / readme-snippets	15s
checks / docs	40s
checks / test (3.10, lowest-direct, windows-latest)	1m 47s
checks / test (3.10, lowest-direct, ubuntu-latest)	1m 22s
checks / test (3.11, lowest-direct, ubuntu-latest)	1m 26s
checks / test (3.12, locked, ubuntu-latest)	1m 37s
checks / test (3.12, lowest-direct, windows-latest)	1m 40s
checks / test (3.10, locked, ubuntu-latest)	1m 27s
checks / pre-commit	59s
checks / test (3.12, lowest-direct, ubuntu-latest)	1m 29s
checks / test (3.11, locked, ubuntu-latest)	1m 25s
checks / test (3.11, lowest-direct, windows-latest)	1m 46s
checks / test (3.11, locked, windows-latest)	2m 31s
checks / test (3.10, locked, windows-latest)	1m 56s
checks / test (3.13, lowest-direct, ubuntu-latest)	1m 26s
checks / test (3.12, locked, windows-latest)	2m 12s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 13s
checks / test (3.13, locked, windows-latest)	1m 47s
checks / test (3.13, locked, ubuntu-latest)	1m 11s
checks / test (3.13, lowest-direct, windows-latest)	1m 51s
checks / test (3.14, locked, windows-latest)	2m 33s
checks / test (3.14, lowest-direct, windows-latest)	1m 54s
checks / test (3.14, locked, ubuntu-latest)	2m 20s
all-green	5s
	36m 52s

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