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Carry `nonce` and `claimsAsJSON` through Device Policy flows #1086

Job	Run time
signin-sample-spm-build	2m 26s
pod-lib-lint (macos-15, GoogleSignIn.podspec)	9m 3s
spm-build-test (macos-15, macosx)	2m 25s
xcode-27-preview-test (macosx)	1m 9s
xcode-27-preview-test (iphonesimulator)	5m 14s
pod-lib-lint (macos-15, GoogleSignInSwiftSupport.podspec, --use-static-frameworks)	12m 14s
signin-sample-pods-build	2m 39s
pod-lib-lint (macos-15, GoogleSignIn.podspec, --use-static-frameworks)	14m 11s
pod-lib-lint (macos-15, GoogleSignInSwiftSupport.podspec)	11m 3s
spm-build-test (macos-15, iphonesimulator)	3m 56s
	1h 4m 20s