Remove deprecated Google Mobile Ads (GMA) C++ SDK #13773

Job	Run time
check_and_prepare	24s
build-desktop-windows-latest-x64-openssl	1h 37m 20s
build-desktop-ubuntu-22.04-x64-openssl	37m 32s
build-ios-macos-14	1h 25m 18s
build-android-macos-14	1h 17m 0s
build-android-windows-latest	1h 11m 24s
build-tvos-macos-14	35m 24s
build-android-ubuntu-22.04	53m 5s
test-tvos-macos-14-tvos_simulator	16m 59s
test-android-ubuntu-22.04-emulator_ftl_target-gameloop	12m 21s
test-android-macos-14-emulator_ftl_target-gameloop	8m 12s
test-android-windows-latest-emulator_ftl_target-gameloop	12m 42s
test-android-ubuntu-22.04-android_target-gameloop	9m 32s
test-android-windows-latest-android_target-gameloop	19m 11s
test-android-macos-14-android_target-gameloop	27m 1s
test-ios-macos-14-simulator_target-gameloop	37m 11s
test-ios-macos-14-ios_target-gameloop	12m 7s
test-desktop-windows-latest-x64-openssl	8m 37s
test-desktop-ubuntu-22.04-x64-openssl	4m 0s
summarize-results	19s
attempt-retry	0s
	10h 25m 39s

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