ci: add strict-no-cover to detect unnecessary coverage pragmas #329

Job	Run time
checks / readme-snippets	15s
checks / pre-commit	29s
checks / test (3.12, locked, ubuntu-latest)	56s
checks / test (3.12, locked, windows-latest)	3m 20s
checks / test (3.10, lowest-direct, windows-latest)	2m 48s
checks / test (3.12, lowest-direct, ubuntu-latest)	1m 1s
checks / test (3.10, lowest-direct, ubuntu-latest)	52s
checks / test (3.11, lowest-direct, windows-latest)	2m 39s
checks / test (3.11, lowest-direct, ubuntu-latest)	54s
checks / test (3.11, locked, ubuntu-latest)	43s
checks / test (3.12, lowest-direct, windows-latest)	4m 13s
checks / test (3.14, locked, windows-latest)	3m 16s
checks / test (3.14, lowest-direct, windows-latest)	2m 35s
checks / test (3.10, locked, windows-latest)	2m 23s
checks / test (3.13, lowest-direct, windows-latest)	3m 21s
checks / test (3.13, locked, ubuntu-latest)	46s
checks / test (3.14, locked, ubuntu-latest)	2m 21s
checks / test (3.10, locked, ubuntu-latest)	49s
checks / test (3.13, locked, windows-latest)	2m 25s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 13s
checks / test (3.13, lowest-direct, ubuntu-latest)	55s
checks / test (3.11, locked, windows-latest)	2m 27s
all-green	5s
	40m 46s

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