ci: add strict-no-cover to detect unnecessary coverage pragmas #327

Job	Run time
checks / pre-commit	7s
checks / readme-snippets	8s
checks / test (3.10, locked, windows-latest)	1m 37s
checks / test (3.12, locked, ubuntu-latest)	5s
checks / test (3.13, lowest-direct, windows-latest)	25s
checks / test (3.10, lowest-direct, ubuntu-latest)	6s
checks / test (3.13, lowest-direct, ubuntu-latest)	9s
checks / test (3.11, lowest-direct, windows-latest)	28s
checks / test (3.14, lowest-direct, ubuntu-latest)	7s
checks / test (3.10, lowest-direct, windows-latest)	41s
checks / test (3.13, locked, ubuntu-latest)	10s
checks / test (3.12, locked, windows-latest)	19s
checks / test (3.14, lowest-direct, windows-latest)	20s
checks / test (3.11, locked, ubuntu-latest)	7s
checks / test (3.11, lowest-direct, ubuntu-latest)	10s
checks / test (3.14, locked, windows-latest)	19s
checks / test (3.12, lowest-direct, windows-latest)	42s
checks / test (3.11, locked, windows-latest)	22s
checks / test (3.14, locked, ubuntu-latest)	6s
checks / test (3.10, locked, ubuntu-latest)	9s
checks / test (3.13, locked, windows-latest)	28s
checks / test (3.12, lowest-direct, ubuntu-latest)	8s
all-green	4s
	7m 17s

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