Remove deprecated Google Mobile Ads (GMA) C++ SDK #13763

Job	Run time
check_and_prepare	26s
build-android-ubuntu-22.04	48s
build-ios-macos-14	1m 20s
build-android-windows-latest	3m 19s
build-android-macos-14	1m 40s
build-desktop-windows-latest-x64-openssl	2m 41s
build-desktop-ubuntu-22.04-x64-openssl	54s
build-tvos-macos-14	1m 17s
test-tvos-macos-14-tvos_simulator	12s
test-ios-macos-14-simulator_target-gameloop	18s
test-ios-macos-14-ios_target-gameloop	15s
test-desktop-ubuntu-22.04-x64-openssl	11s
test-desktop-windows-latest-x64-openssl	16s
test-android-ubuntu-22.04-emulator_ftl_target-gameloop	13s
test-android-macos-14-emulator_ftl_target-gameloop	9s
test-android-ubuntu-22.04-android_target-gameloop	14s
test-android-windows-latest-android_target-gameloop	9s
test-android-macos-14-android_target-gameloop	9s
test-android-windows-latest-emulator_ftl_target-gameloop	8s
summarize-results	28s
attempt-retry	0s
	15m 7s

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