Tests

Add a dedicated manual maintenance mode flag #1780

Job	Run time
Test docker image	3m 28s
Test we can build PyPI package	53s
Run test suite (ubuntu-20.04, 3.8)	3m 51s
check	28s
Run test suite (ubuntu-20.04, 3.9)	4m 13s
Run test suite (ubuntu-20.04, 3.10)	3m 43s
Inspect test runner output in the context of a Github Workflow	22s
Run test suite (ubuntu-22.04, 3.8)	4m 4s
Run test suite (ubuntu-22.04, 3.9)	4m 13s
Run test suite (ubuntu-22.04, 3.10)	4m 12s
Run test suite (windows-2019, 3.8)	1m 55s
Run test suite (windows-2019, 3.9)	1m 58s
Run test suite (windows-2019, 3.10)	1m 59s
Run test suite (macos-14, 3.8)	1m 12s
Run test suite (macos-14, 3.9)	1m 5s
Run test suite (macos-14, 3.10)	50s
required-checks	8s
	38m 34s

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