Add GMA C++ deprecation notice #11487

Job	Run time
check_and_prepare	15s
build-android-ubuntu-20.04	7m 1s
build-desktop-ubuntu-20.04-x64-openssl	2m 16s
build-tvos-${{ matrix.os }}	0s
build-android-macos-13	9m 57s
build-desktop-macos-13-x64-openssl	6m 11s
build-ios-macos-13	28m 48s
build-android-windows-latest	13m 18s
build-desktop-windows-latest-x64-openssl	8m 22s
test-tvos-${{ matrix.build_os }}-${{ matrix.tvos_device }}	0s
test-desktop-ubuntu-20.04-x64-openssl	54s
test-desktop-${{ matrix.os }}-${{ matrix.arch }}-${{ matrix.ssl_variant }}-custom-runner	0s
test-desktop-macos-13-x64-openssl	1m 24s
test-desktop-windows-latest-x64-openssl	1m 55s
test-android-ubuntu-20.04-android_target-gameloop	11m 11s
test-android-ubuntu-20.04-emulator_ftl_target-gameloop	3m 1s
test-android-macos-13-android_target-gameloop	4m 39s
test-android-macos-13-emulator_ftl_target-gameloop	3m 7s
test-android-windows-latest-android_target-gameloop	4m 3s
test-android-windows-latest-emulator_ftl_target-gameloop	3m 15s
test-ios-macos-13-ios_target-gameloop	6m 40s
test-ios-macos-13-simulator_target-gameloop	12m 35s
summarize-results	10s
attempt-retry	0s
	2h 9m 2s

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