[Infra] Add job that builds ClientApp with source Firestore via SPM #7860

Job	Run time
Check changed files	0s
binary_size_metrics (iOS)	6m 5s
pod-lib-lint-abtesting (iOS)	6m 46s
pod-lib-lint-auth (iOS)	8m 39s
pod-lib-lint-database (iOS)	7m 6s
pod-lib-lint-dynamiclinks (iOS)	6m 17s
pod-lib-lint-firestore (iOS)	27m 49s
pod-lib-lint-functions (iOS)	6m 29s
pod-lib-lint-inappmessaging (iOS)	8m 37s
pod-lib-lint-messaging (iOS)	12m 24s
pod-lib-lint-performance (iOS)	12m 32s
pod-lib-lint-remoteconfig (iOS)	8m 35s
pod-lib-lint-storage (iOS)	7m 21s
create_report	4m 17s
	2h 2m 57s

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