ci: add strict-no-cover to detect unnecessary coverage pragmas #286

Job	Run time
checks / pre-commit	36s
checks / readme-snippets	13s
checks / test (3.11, lowest-direct, ubuntu-latest)	48s
checks / test (3.12, lowest-direct, windows-latest)	4m 6s
checks / test (3.10, locked, windows-latest)	2m 30s
checks / test (3.10, locked, ubuntu-latest)	47s
checks / test (3.11, locked, windows-latest)	2m 34s
checks / test (3.11, locked, ubuntu-latest)	45s
checks / test (3.11, lowest-direct, windows-latest)	2m 52s
checks / test (3.10, lowest-direct, windows-latest)	2m 33s
checks / test (3.10, lowest-direct, ubuntu-latest)	48s
checks / test (3.12, lowest-direct, ubuntu-latest)	48s
checks / test (3.13, locked, windows-latest)	2m 30s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 15s
checks / test (3.14, locked, windows-latest)	3m 45s
checks / test (3.12, locked, ubuntu-latest)	48s
checks / test (3.13, lowest-direct, windows-latest)	3m 18s
checks / test (3.14, lowest-direct, windows-latest)	2m 18s
checks / test (3.13, lowest-direct, ubuntu-latest)	46s
checks / test (3.13, locked, ubuntu-latest)	49s
checks / test (3.14, locked, ubuntu-latest)	2m 33s
checks / test (3.12, locked, windows-latest)	3m 31s
all-green	4s
	40m 57s

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