Add feature flag to skip computing baseline file coverage information on PRs #6759

Job	Run time
Ruby analysis (macos-latest, nightly-latest)	10s
Ruby analysis (ubuntu-latest, nightly-latest)	10s
Ruby analysis (ubuntu-latest, linked)	10s
Ruby analysis (macos-latest, linked)	11s
Ruby analysis (macos-latest, default)	12s
Ruby analysis (ubuntu-latest, default)	11s
	1m 4s

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