[Infra] Enable testing for iOS 13+ client app scheme #5990

Job	Run time
spm-binary-cron	0s
changes	5s
check	4m 6s
pod-lib-lint-cron	0s
cmake (macos-12)	32m 25s
cmake-prod-db (macos-12, (default))	36m 22s
cmake (ubuntu-latest)	16m 43s
pod-lib-lint (FirebaseFirestoreInternal.podspec)	34m 30s
cmake-prod-db (macos-12, test-db)	36m 46s
pod-lib-lint (FirebaseFirestore.podspec)	36m 10s
pod-lib-lint (FirebaseFirestoreSwift.podspec)	34m 10s
sanitizers (macos-12, asan)	35m 25s
sanitizers (macos-12, tsan)	41m 44s
spm-binary	4m 29s
spm-source	22m 34s
xcodebuild (iOS)	44m 44s
xcodebuild (tvOS)	23m 55s
xcodebuild (macOS)	36m 47s
Check all required Firestore tests results	1s
	7h 20m 56s

Provide feedback