Implement UseUserAccessGroup for Firebase Auth C++ SDK #13656

Job	Run time
check_and_prepare	6s
build-tvos-${{ matrix.os }}	1s
build-android-${{ matrix.os }}	1s
build-desktop-${{ matrix.os }}-${{ matrix.arch }}-${{ matrix.ssl_variant }}	1s
test-desktop-${{ matrix.os }}-${{ matrix.arch }}-${{ matrix.ssl_variant }}	1s
build-ios-${{ matrix.os }}	1s
test-tvos-${{ matrix.build_os }}-${{ matrix.tvos_device }}	1s
test-android-${{ matrix.build_os }}-${{ matrix.android_device }}-${{ matrix.test_type }}	1s
summarize-results	1s
attempt-retry	1s
test-ios-${{ matrix.build_os }}-${{ matrix.ios_device }}-${{ matrix.test_type }}	1s
	16s

Provide feedback