chore(stale-flags): add stale flags app to installed apps #7047

Job	Run time
E2E Local - Segments-1, Environment	4m 9s
E2E Local - Segments-2	4m 20s
Validate Conventional Commit title	2s
E2E Unified - Segments-1, Environment	5m 44s
E2E Local - Segments-3, Signup, Flag, Invite, Project	4m 4s
E2E Local - Versioning	3m 50s
E2E Unified - Versioning	5m 30s
E2E Unified - Segments-3, Signup, Flag, Invite, Project	6m 6s
E2E Unified - Segments-2	6m 14s
Test api docker image build	0s
Test unified docker image build	0s
Test frontend docker image build	0s
	39m 59s

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