Refactor stream to notify first and next #8971

Job	Run time
changes	4s
spm-package-resolved	52s
spm-binary-cron	0s
check	1m 41s
sanitizers-ubuntu (ubuntu-latest, asan)	16m 57s
cmake-prod-db (macos-14, (default))	17m 10s
cmake (macos-14)	13m 19s
sanitizers-mac (macos-14, asan)	19m 42s
cmake-prod-db (macos-14, test-db)	15m 41s
cmake (ubuntu-latest)	16m 10s
sanitizers-mac (macos-14, tsan)	15m 27s
check-firestore-internal-public-headers	5s
pod-lib-lint (FirebaseFirestoreInternal.podspec)	31m 48s
spm-binary	5m 28s
spm-source (iOS, macos-14, Xcode_15.2)	23m 28s
pod-lib-lint-cron	0s
pod-lib-lint (FirebaseFirestore.podspec)	22m 38s
spm-source (iOS, macos-14, Xcode_16)	16m 41s
spm-source (tvOS, macos-14, Xcode_15.2)	22m 35s
xcodebuild (iOS)	35m 51s
spm-source (tvOS, macos-14, Xcode_16)	21m 56s
xcodebuild (macOS)	35m 28s
spm-source (macOS, macos-14, Xcode_15.2)	20m 46s
xcodebuild (tvOS)	46m 12s
spm-source (macOS, macos-14, Xcode_16)	26m 9s
Check all required Firestore tests results	1s
	7h 6m 9s

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