Add feature flag to skip computing baseline file coverage information on PRs #6758

Job	Run time
Ruby analysis (macos-latest, linked)	54s
Ruby analysis (macos-latest, nightly-latest)	55s
Ruby analysis (ubuntu-latest, nightly-latest)	48s
Ruby analysis (ubuntu-latest, linked)	56s
Ruby analysis (macos-latest, default)	1m 27s
Ruby analysis (ubuntu-latest, default)	47s
	5m 47s

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