ci: add strict-no-cover to detect unnecessary coverage pragmas #328

Job	Run time
checks / readme-snippets	10s
checks / pre-commit	35s
checks / test (3.10, lowest-direct, ubuntu-latest)	55s
checks / test (3.10, lowest-direct, windows-latest)	2m 54s
checks / test (3.10, locked, windows-latest)	2m 26s
checks / test (3.13, locked, ubuntu-latest)	42s
checks / test (3.11, locked, ubuntu-latest)	48s
checks / test (3.12, lowest-direct, windows-latest)	3m 41s
checks / test (3.14, locked, ubuntu-latest)	2m 16s
checks / test (3.12, locked, ubuntu-latest)	48s
checks / test (3.10, locked, ubuntu-latest)	50s
checks / test (3.12, locked, windows-latest)	3m 27s
checks / test (3.14, locked, windows-latest)	3m 11s
checks / test (3.12, lowest-direct, ubuntu-latest)	1m 3s
checks / test (3.14, lowest-direct, windows-latest)	2m 25s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 8s
checks / test (3.13, locked, windows-latest)	2m 31s
checks / test (3.13, lowest-direct, windows-latest)	2m 38s
checks / test (3.13, lowest-direct, ubuntu-latest)	49s
checks / test (3.11, lowest-direct, windows-latest)	2m 40s
checks / test (3.11, lowest-direct, ubuntu-latest)	51s
checks / test (3.11, locked, windows-latest)	2m 35s
all-green	3s
	39m 26s

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