ci: add strict-no-cover to detect unnecessary coverage pragmas #285

Job	Run time
checks / pre-commit	33s
checks / readme-snippets	17s
checks / test (3.12, locked, ubuntu-latest)	52s
checks / test (3.10, locked, ubuntu-latest)	50s
checks / test (3.12, locked, windows-latest)	3m 24s
checks / test (3.12, lowest-direct, windows-latest)	3m 39s
checks / test (3.12, lowest-direct, ubuntu-latest)	56s
checks / test (3.10, locked, windows-latest)	2m 40s
checks / test (3.11, locked, ubuntu-latest)	43s
checks / test (3.10, lowest-direct, ubuntu-latest)	53s
checks / test (3.13, locked, windows-latest)	2m 27s
checks / test (3.13, lowest-direct, windows-latest)	2m 39s
checks / test (3.11, locked, windows-latest)	3m 9s
checks / test (3.11, lowest-direct, windows-latest)	2m 41s
checks / test (3.13, lowest-direct, ubuntu-latest)	55s
checks / test (3.10, lowest-direct, windows-latest)	2m 33s
checks / test (3.14, lowest-direct, windows-latest)	2m 18s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 9s
checks / test (3.11, lowest-direct, ubuntu-latest)	51s
checks / test (3.13, locked, ubuntu-latest)	47s
checks / test (3.14, locked, ubuntu-latest)	2m 30s
checks / test (3.14, locked, windows-latest)	3m 56s
all-green	3s
	40m 45s

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