feat(appcheck): implement RecaptchaEnterpriseProvider and tests #423

Job	Run time
pod_lib_lint / pod-lib-lint (macos-15, Xcode_26.2, macOS)	53s
spm / spm-package-resolved	43s
pod_lib_lint / pod-lib-lint (macos-26, Xcode_26.4, iOS)	2m 42s
catalyst / catalyst	3m 0s
pod_lib_lint / pod-lib-lint (macos-26, Xcode_26.4, watchOS)	1m 18s
performance (tvOS, unit) / check_secrets	3s
pod_lib_lint / pod-lib-lint (macos-15, Xcode_26.2, watchOS)	46s
pod_lib_lint / pod-lib-lint (macos-26, Xcode_26.4, macOS)	1m 6s
quickstart / quickstart (Performance)	7m 51s
performance (tvOS, proddev) / check_secrets	2s
performance (iOS, unit) / check_secrets	3s
pod_lib_lint / pod-lib-lint (macos-15, Xcode_26.2, tvOS)	2m 32s
pod_lib_lint / pod-lib-lint (macos-26, Xcode_26.4, tvOS)	2m 40s
pod_lib_lint / pod-lib-lint (macos-15, Xcode_26.2, iOS)	6m 58s
performance (iOS, proddev) / check_secrets	4s
performance (tvOS, proddev) / build	2m 41s
performance (tvOS, unit) / build	5m 30s
performance (iOS, unit) / build	9m 29s
performance (iOS, proddev) / build	2m 3s
spm / spm	-1s
performance-cron-only / cron-job	0s
	50m 23s

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