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Fix inconsistent EMM error handling #1110

Job	Run time
signin-sample-spm-build	2m 2s
xcode-27-preview-test (macosx)	1m 58s
signin-sample-pods-build	3m 11s
spm-build-test (macos-15, iphonesimulator, true)	4m 34s
pod-lib-lint (macos-15, GoogleSignInSwiftSupport.podspec, --use-static-frameworks)	5m 37s
spm-build-test (macos-15, iphonesimulator, false)	1m 46s
pod-lib-lint (macos-15, GoogleSignIn.podspec)	9m 45s
pod-lib-lint (macos-15, GoogleSignInSwiftSupport.podspec)	13m 36s
spm-build-test (macos-15, macosx, false)	4m 14s
xcode-27-preview-test (iphonesimulator)	4m 55s
pod-lib-lint (macos-15, GoogleSignIn.podspec, --use-static-frameworks)	11m 4s
pod-lib-lint (macos-15, GoogleSignIn.podspec, --use-static-frameworks)	14m 57s
spm-build-test (macos-15, macosx, false)	4m 14s
spm-build-test (macos-15, iphonesimulator, true)	4m 34s
xcode-27-preview-test (iphonesimulator)	4m 55s
signin-sample-spm-build	2m 2s
signin-sample-pods-build	3m 11s
xcode-27-preview-test (macosx)	1m 58s
pod-lib-lint (macos-15, GoogleSignIn.podspec)	9m 45s
pod-lib-lint (macos-15, GoogleSignInSwiftSupport.podspec)	13m 36s
spm-build-test (macos-15, iphonesimulator, false)	1m 46s
pod-lib-lint (macos-15, GoogleSignInSwiftSupport.podspec, --use-static-frameworks)	5m 37s
	2h 9m 17s