[Release] Add release note for signed artifact changes #8817

Job	Run time
Check changed files	0s
pod-lib-lint-auth (iOS)	9m 15s
pod-lib-lint-abtesting (iOS)	5m 11s
pod-lib-lint-database (iOS)	10m 22s
pod-lib-lint-dynamiclinks (iOS)	11m 53s
pod-lib-lint-firestore (iOS)	59m 53s
pod-lib-lint-functions (iOS)	2m 30s
pod-lib-lint-inappmessaging (iOS)	5m 55s
pod-lib-lint-messaging (iOS)	6m 9s
pod-lib-lint-performance (iOS)	7m 24s
pod-lib-lint-remoteconfig (iOS)	11m 0s
pod-lib-lint-storage (iOS)	6m 18s
create_report	6m 22s
	2h 22m 12s

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