ci: add strict-no-cover to detect unnecessary coverage pragmas #284

Job	Run time
checks / readme-snippets	11s
checks / pre-commit	29s
checks / test (3.10, lowest-direct, windows-latest)	2m 30s
checks / test (3.10, lowest-direct, ubuntu-latest)	46s
checks / test (3.10, locked, windows-latest)	2m 25s
checks / test (3.11, lowest-direct, ubuntu-latest)	42s
checks / test (3.10, locked, ubuntu-latest)	44s
checks / test (3.11, locked, windows-latest)	2m 34s
checks / test (3.11, locked, ubuntu-latest)	48s
checks / test (3.12, lowest-direct, ubuntu-latest)	52s
checks / test (3.12, locked, windows-latest)	3m 25s
checks / test (3.12, lowest-direct, windows-latest)	4m 24s
checks / test (3.11, lowest-direct, windows-latest)	2m 50s
checks / test (3.13, lowest-direct, ubuntu-latest)	49s
checks / test (3.13, locked, ubuntu-latest)	43s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 12s
checks / test (3.12, locked, ubuntu-latest)	48s
checks / test (3.13, lowest-direct, windows-latest)	2m 41s
checks / test (3.13, locked, windows-latest)	2m 47s
checks / test (3.14, lowest-direct, windows-latest)	3m 12s
checks / test (3.14, locked, windows-latest)	3m 23s
checks / test (3.14, locked, ubuntu-latest)	2m 23s
all-green	5s
	40m 43s

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