Add handling of `.skip_lint` file(s) #224

Job	Run time
Setup as in CI for workflows (3.11)	4m 7s
Setup as in PR for workflows (3.11)	49s
Test linting of workflows (3.11)	35s
Test testing of workflows (0, 3.11)	8m 43s
Test testing of workflows (1, 3.11)	7m 6s
Test combining 'chunked' test results (3.11)	31s
	21m 51s

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