Implement Firebase Auth UseUserAccessGroup for C++ iOS SDK #13658

Job	Run time
check_and_prepare	20s
build-android-macos-14	50s
build-desktop-ubuntu-22.04-x64-openssl	1m 2s
build-android-windows-latest	44s
build-desktop-windows-latest-x64-openssl	46s
build-tvos-macos-14	49s
build-android-ubuntu-22.04	50s
build-ios-macos-14	50s
test-tvos-${{ matrix.build_os }}-${{ matrix.tvos_device }}	1s
test-ios-${{ matrix.build_os }}-${{ matrix.ios_device }}-${{ matrix.test_type }}	1s
test-android-${{ matrix.build_os }}-${{ matrix.android_device }}-${{ matrix.test_type }}	1s
test-desktop-${{ matrix.os }}-${{ matrix.arch }}-${{ matrix.ssl_variant }}	1s
summarize-results	1s
attempt-retry	1s
	6m 17s

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