Add handling of `.skip_lint` file(s) (#58) #229

Job	Run time
Setup as in CI for tools (3.11)	3m 35s
Setup as in PR for tools (3.11)	3m 38s
Test linting of tools (3.11)	34s
Test testing of tools (0, 3.11)	3m 28s
Test testing of tools (1, 3.11)	4m 3s
Test testing of tools (2, 3.11)	4m 28s
Test combining 'chunked' test results (3.11)	38s
	20m 24s

Provide feedback