Add `FeatureFlagIntegration` #5624

Job	Run time
macos \| stable	27s
macos \| beta	32s
cancel-previous-workflow	2s
ubuntu \| stable	31s
ubuntu \| beta	18s
windows \| stable	55s
windows \| beta	40s
analyze / analyze	42s
analyze / cancel-previous-workflow	3s
analyze / package-analysis	1m 6s
	5m 16s

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