[Firestore] Consolidate Firestore and FirestoreSwift #5847

Job	Run time
changes	6s
spm-binary-cron	0s
check	6m 22s
sanitizers (macos-12, asan)	34m 27s
sanitizers (macos-12, tsan)	35m 47s
xcodebuild (iOS)	44m 35s
cmake-prod-db (macos-12, (default))	22m 24s
xcodebuild (tvOS)	31m 31s
cmake (macos-12)	33m 8s
cmake-prod-db (macos-12, test-db)	29m 42s
xcodebuild (macOS)	24m 45s
cmake (ubuntu-latest)	16m 59s
pod-lib-lint (FirebaseFirestore.podspec)	32m 0s
pod-lib-lint (FirebaseFirestoreSwift.podspec)	31m 11s
spm-binary	4m 25s
pod-lib-lint-cron	0s
spm-source	24m 31s
Check all required Firestore tests results	1s
	6h 11m 54s

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