Add handling of `.skip_lint` file(s) (#58) #230

Job	Run time
Setup as in CI for tools (3.11)	3m 30s
Setup as in PR for tools (3.11)	46s
Test linting of tools (3.11)	31s
Test testing of tools (0, 3.11)	4m 49s
Test testing of tools (1, 3.11)	3m 34s
Test testing of tools (2, 3.11)	3m 34s
Test combining 'chunked' test results (3.11)	30s
	17m 14s

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