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Add feature flag to skip computing baseline file coverage information on PRs #79

Job	Run time
CCR (ubuntu-latest, stable-v2.20.7)	1m 14s
CCR (ubuntu-latest, nightly-latest)	1m 0s
CCR (ubuntu-latest, default)	1m 0s
CCR (ubuntu-latest, stable-v2.22.4)	1m 5s
CCR (ubuntu-latest, stable-v2.21.4)	1m 7s
CCR (ubuntu-latest, stable-v2.17.6)	1m 6s
CCR (ubuntu-latest, stable-v2.19.4)	1m 9s
CCR (ubuntu-latest, stable-v2.18.4)	1m 16s
CCR (ubuntu-latest, linked)	55s
	9m 52s