Cherry pick PR #3239: Add --ephemeral option to win runner #725

Job	Run time
android-arm / initialize	37s
android-arm64 / initialize	38s
android-x86 / initialize	35s
android-x86 / docker-build-image	34s
android-x86 / docker-unittest-image	0s
android-arm / docker-build-image	34s
android-arm / docker-unittest-image	0s
android-arm64 / docker-build-image	36s
android-arm64 / docker-unittest-image	0s
android-x86 / x86_devel	15m 51s
android-x86 / x86_debug	18m 58s
android-x86 / x86_qa	9m 12s
android-x86 / x86_gold	9m 19s
android-arm / arm_devel	16m 55s
android-arm / arm_debug	17m 36s
android-arm64 / arm64_devel	18m 0s
android-arm / arm_qa	9m 15s
android-arm64 / arm64_debug	15m 51s
android-arm / arm_gold	9m 9s
android-arm64 / arm64_qa	9m 28s
android-arm64 / arm64_gold	10m 54s
android-arm / ${{ matrix.name }}_${{ matrix.shard }}_test	0s
android-arm / ${{ matrix.name }}_on_device_${{ matrix.type }}	0s
android-arm64 / ${{ matrix.name }}_on_device_${{ matrix.type }}	0s
android-arm64 / ${{ matrix.name }}_${{ matrix.shard }}_test	0s
android-x86 / ${{ matrix.name }}_${{ matrix.shard }}_test	0s
android-x86 / ${{ matrix.name }}_on_device_${{ matrix.type }}	0s
	2h 44m 2s

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