Add `FeatureFlagIntegration` #5653

Job	Run time
macos \| stable	24s
macos \| beta	22s
ubuntu \| stable	30s
ubuntu \| beta	20s
cancel-previous-workflow	2s
windows \| stable	36s
windows \| beta	35s
analyze / cancel-previous-workflow	4s
analyze / analyze	40s
analyze / package-analysis	1m 36s
	5m 9s

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