[Infra] Rename references from `master` to `main` #8227

Job	Run time
Check changed files	0s
pod-lib-lint-abtesting (iOS)	9m 25s
binary_size_metrics (iOS)	7m 20s
pod-lib-lint-auth (iOS)	6m 56s
pod-lib-lint-database (iOS)	8m 28s
pod-lib-lint-dynamiclinks (iOS)	7m 58s
pod-lib-lint-firestore (iOS)	22m 9s
pod-lib-lint-functions (iOS)	4m 16s
pod-lib-lint-inappmessaging (iOS)	8m 35s
pod-lib-lint-messaging (iOS)	9m 30s
pod-lib-lint-performance (iOS)	10m 11s
pod-lib-lint-remoteconfig (iOS)	12m 52s
pod-lib-lint-storage (iOS)	13m 40s
create_report	3m 11s
	2h 4m 31s

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