Add feature flag to skip computing baseline file coverage information on PRs #11249

Job	Run time
analyze-other (actions)	51s
analyze-other (python)	1m 1s
check-codeql-versions	30s
analyze-javascript (ubuntu-24.04)	4m 23s
analyze-javascript (ubuntu-22.04, linked)	4m 21s
analyze-javascript (windows-2022, linked)	5m 28s
analyze-javascript (ubuntu-24.04, linked)	4m 29s
analyze-javascript (windows-2025)	5m 49s
analyze-javascript (macos-15, linked)	13m 6s
analyze-javascript (macos-15)	10m 33s
analyze-javascript (macos-14)	8m 46s
analyze-javascript (ubuntu-22.04)	4m 24s
analyze-javascript (windows-2025, linked)	5m 18s
analyze-javascript (macos-14, linked)	5m 33s
analyze-javascript (windows-2022)	5m 52s
	1h 20m 24s

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