Support ignoring generated files #6686

Job	Run time
Ruby analysis (ubuntu-latest, nightly-latest)	50s
Ruby analysis (ubuntu-latest, default)	48s
Ruby analysis (ubuntu-latest, linked)	49s
Ruby analysis (macos-latest, linked)	1m 12s
Ruby analysis (macos-latest, default)	1m 8s
Ruby analysis (macos-latest, nightly-latest)	1m 29s
	6m 16s

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