ci: add strict-no-cover to detect unnecessary coverage pragmas #296

Job	Run time
checks / readme-snippets	10s
checks / pre-commit	34s
checks / test (3.10, locked, ubuntu-latest)	46s
checks / test (3.10, lowest-direct, windows-latest)	3m 1s
checks / test (3.11, lowest-direct, windows-latest)	2m 54s
checks / test (3.11, locked, ubuntu-latest)	44s
checks / test (3.11, lowest-direct, ubuntu-latest)	45s
checks / test (3.13, locked, ubuntu-latest)	46s
checks / test (3.10, lowest-direct, ubuntu-latest)	48s
checks / test (3.12, lowest-direct, ubuntu-latest)	51s
checks / test (3.13, lowest-direct, ubuntu-latest)	45s
checks / test (3.12, locked, windows-latest)	3m 32s
checks / test (3.13, lowest-direct, windows-latest)	2m 45s
checks / test (3.12, locked, ubuntu-latest)	51s
checks / test (3.11, locked, windows-latest)	3m 18s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 13s
checks / test (3.12, lowest-direct, windows-latest)	3m 47s
checks / test (3.13, locked, windows-latest)	2m 48s
checks / test (3.14, lowest-direct, windows-latest)	2m 43s
checks / test (3.10, locked, windows-latest)	2m 33s
checks / test (3.14, locked, ubuntu-latest)	2m 26s
checks / test (3.14, locked, windows-latest)	3m 28s
all-green	5s
	41m 33s

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