Fix FirebaseDatabase integration test files content #3346

Job	Run time
integration	37m 38s
pod-lib-lint (ios, macos-14, Xcode_15.2)	9m 19s
catalyst	3m 45s
pod-lib-lint (ios, macos-14, Xcode_16)	10m 16s
quickstart	1m 48s
pod-lib-lint (tvos, macos-14, Xcode_15.2)	8m 56s
spm-package-resolved	1m 13s
pod-lib-lint (tvos, macos-14, Xcode_16)	7m 31s
pod-lib-lint (macos --skip-tests, macos-14, Xcode_15.2)	4m 36s
pod-lib-lint (macos --skip-tests, macos-14, Xcode_16)	6m 28s
pod-lib-lint (watchos, macos-14, Xcode_15.2)	4m 56s
pod-lib-lint (watchos, macos-14, Xcode_16)	5m 9s
spm (iOS, macos-14, Xcode_15.2)	11m 5s
spm (iOS, macos-14, Xcode_16)	8m 23s
spm (tvOS, macos-14, Xcode_15.2)	5m 50s
spm (tvOS, macos-14, Xcode_16)	4m 57s
spm (macOS, macos-14, Xcode_15.2)	3m 45s
spm (macOS, macos-14, Xcode_16)	7m 9s
spm (catalyst, macos-14, Xcode_15.2)	5m 29s
spm (catalyst, macos-14, Xcode_16)	9m 58s
spm (watchOS, macos-14, Xcode_15.2)	8m 5s
spm (watchOS, macos-14, Xcode_16)	6m 48s
database-cron-only	0s
	2h 53m 4s

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