[Messaging] Cleanup compilation guards for building on older SDKs #9430

Job	Run time
Check changed files	0s
pod-lib-lint-abtesting (iOS)	8m 19s
pod-lib-lint-auth (iOS)	13m 46s
pod-lib-lint-database (iOS)	12m 36s
pod-lib-lint-dynamiclinks (iOS)	7m 29s
pod-lib-lint-firestore (iOS)	21m 36s
pod-lib-lint-functions (iOS)	2m 17s
pod-lib-lint-inappmessaging (iOS)	9m 18s
pod-lib-lint-messaging (iOS)	27m 40s
pod-lib-lint-performance (iOS)	8m 40s
pod-lib-lint-remoteconfig (iOS)	10m 23s
pod-lib-lint-storage (iOS)	11m 24s
create_report	1m 48s
	2h 15m 16s

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