ci: add strict-no-cover to detect unnecessary coverage pragmas #330

Job	Run time
checks / pre-commit	32s
checks / readme-snippets	14s
checks / test (3.10, locked, windows-latest)	2m 15s
checks / test (3.11, locked, ubuntu-latest)	47s
checks / test (3.12, lowest-direct, ubuntu-latest)	57s
checks / test (3.10, lowest-direct, windows-latest)	2m 39s
checks / test (3.12, locked, ubuntu-latest)	52s
checks / test (3.10, locked, ubuntu-latest)	50s
checks / test (3.11, locked, windows-latest)	2m 58s
checks / test (3.11, lowest-direct, ubuntu-latest)	49s
checks / test (3.12, lowest-direct, windows-latest)	3m 36s
checks / test (3.13, lowest-direct, windows-latest)	2m 41s
checks / test (3.13, locked, windows-latest)	2m 29s
checks / test (3.12, locked, windows-latest)	3m 41s
checks / test (3.13, lowest-direct, ubuntu-latest)	54s
checks / test (3.10, lowest-direct, ubuntu-latest)	55s
checks / test (3.13, locked, ubuntu-latest)	46s
checks / test (3.14, lowest-direct, windows-latest)	2m 31s
checks / test (3.14, locked, windows-latest)	3m 23s
checks / test (3.11, lowest-direct, windows-latest)	2m 58s
checks / test (3.14, locked, ubuntu-latest)	2m 23s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 20s
all-green	5s
	40m 35s

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