Remove deprecated Google Mobile Ads (GMA) C++ SDK #13774

Job	Run time
check_and_prepare	22s
build-tvos-macos-14	36m 33s
build-desktop-ubuntu-22.04-x64-openssl	37m 13s
build-desktop-windows-latest-x64-openssl	1h 35m 24s
build-android-macos-14	52m 37s
build-android-ubuntu-22.04	50m 1s
build-ios-macos-14	1h 10m 24s
build-android-windows-latest	1h 7m 35s
test-tvos-macos-14-tvos_simulator	23m 48s
test-android-ubuntu-22.04-emulator_ftl_target-gameloop	11m 10s
test-android-macos-14-android_target-gameloop	12m 14s
test-android-windows-latest-android_target-gameloop	26m 54s
test-android-windows-latest-emulator_ftl_target-gameloop	11m 2s
test-android-ubuntu-22.04-android_target-gameloop	56m 58s
test-android-macos-14-emulator_ftl_target-gameloop	11m 30s
test-ios-macos-14-ios_target-gameloop	13m 10s
test-ios-macos-14-simulator_target-gameloop	36m 56s
test-desktop-ubuntu-22.04-x64-openssl	4m 5s
test-desktop-windows-latest-x64-openssl	8m 22s
summarize-results	17s
attempt-retry	0s
	10h 26m 35s

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