feat(appcheck): implement RecaptchaEnterpriseProvider and tests #255

Job	Run time
catalyst / catalyst	5m 25s
spm / spm-package-resolved	5m 25s
pod_lib_lint / pod-lib-lint (macos-15, Xcode_26.2, iOS)	5m 25s
pod_lib_lint / pod-lib-lint (macos-26, Xcode_26.4, iOS)	5m 25s
pod_lib_lint / pod-lib-lint (macos-15, Xcode_26.2, macOS)	5m 25s
pod_lib_lint / pod-lib-lint (macos-15, Xcode_26.2, watchOS)	5m 25s
pod_lib_lint / pod-lib-lint (macos-26, Xcode_26.4, watchOS)	5m 25s
pod_lib_lint / pod-lib-lint (macos-15, Xcode_26.2, tvOS)	5m 25s
pod_lib_lint / pod-lib-lint (macos-26, Xcode_26.4, macOS)	5m 25s
pod_lib_lint / pod-lib-lint (macos-26, Xcode_26.4, tvOS)	5m 25s
spm / spm	1s
	54m 11s

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