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[App Check] Add SPM AppCheckCore 12.x support #1111

Job	Run time
signin-sample-pods-build	2m 18s
xcode-27-preview-test (iphonesimulator)	10m 0s
xcode-27-preview-test (macosx)	1m 49s
pod-lib-lint (macos-15, GoogleSignIn.podspec, --use-static-frameworks)	8m 44s
pod-lib-lint (macos-15, GoogleSignInSwiftSupport.podspec, --use-static-frameworks)	9m 32s
spm-build-test (macos-15, macosx, false)	2m 33s
signin-sample-spm-build	1m 47s
pod-lib-lint (macos-15, GoogleSignIn.podspec)	8m 39s
spm-build-test (macos-15, iphonesimulator, true)	4m 45s
spm-build-test (macos-15, iphonesimulator, false)	4m 49s
pod-lib-lint (macos-15, GoogleSignInSwiftSupport.podspec)	12m 9s
	1h 7m 5s