Remove dead code from FirebaseRemoteConfig #3790

Job	Run time
spm-package-resolved	1m 2s
pod-lib-lint (ios, FirebaseRemoteConfig.podspec, macos-14, Xcode_15.3, --allow-warnings)	35m 16s
remoteconfig (iOS)	32m 26s
pod-lib-lint (ios, FirebaseRemoteConfig.podspec, macos-15, Xcode_16.1, --skip-tests)	2m 21s
pod-lib-lint (tvos, FirebaseRemoteConfig.podspec, macos-14, Xcode_15.3, --allow-warnings)	11m 26s
catalyst	8m 27s
pod-lib-lint (tvos, FirebaseRemoteConfig.podspec, macos-15, Xcode_16.1, --skip-tests)	2m 7s
quickstart	4m 52s
sample-build-test	5m 35s
pod-lib-lint (macos --skip-tests, FirebaseRemoteConfig.podspec, macos-14, Xcode_15.3, --allow-war...	3m 35s
pod-lib-lint (macos --skip-tests, FirebaseRemoteConfig.podspec, macos-15, Xcode_16.1, --skip-tests)	2m 24s
pod-lib-lint (watchos, FirebaseRemoteConfig.podspec, macos-14, Xcode_15.3, --allow-warnings)	2m 35s
pod-lib-lint (watchos, FirebaseRemoteConfig.podspec, macos-15, Xcode_16.1, --skip-tests)	1m 57s
spm (macos-13, Xcode_15.2, iOS, spm)	21m 37s
spm (macos-14, Xcode_15.4, iOS, spm)	21m 3s
spm (macos-15, Xcode_16.1, iOS, spm)	5m 56s
spm (macos-15, Xcode_16.1, tvOS, spm)	4m 50s
spm (macos-15, Xcode_16.1, macOS, spm)	4m 57s
spm (macos-15, Xcode_16.1, watchOS, spmbuildonly)	5m 12s
spm (macos-15, Xcode_16.1, catalyst, spm)	4m 39s
spm (macos-15, Xcode_16.1, visionOS, spm)	6m 10s
remoteconfig-cron-only	0s
	3h 8m 27s

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