Add tests for POSIX write. #12039

Job	Run time
android-arm / initialize	48s
android-arm64 / initialize	47s
android-x86 / initialize	44s
android-x86 / docker-build-image	1m 22s
android-x86 / docker-unittest-image	0s
android-arm64 / docker-build-image	1m 39s
android-arm64 / docker-unittest-image	0s
android-arm / docker-build-image	1m 21s
android-arm / docker-unittest-image	0s
android-x86 / x86_devel	21m 30s
android-x86 / x86_debug	20m 4s
android-x86 / x86_qa	9m 49s
android-x86 / x86_gold	9m 45s
android-arm / arm_devel	18m 22s
android-arm / arm_debug	19m 36s
android-arm / arm_qa	9m 16s
android-arm / arm_gold	9m 43s
android-arm64 / arm64_devel	24m 3s
android-arm64 / arm64_debug	21m 28s
android-arm64 / arm64_qa	10m 16s
android-arm64 / arm64_gold	9m 10s
android-arm / ${{ matrix.name }}_${{ matrix.shard }}_test	0s
android-arm / ${{ matrix.name }}_on_device_${{ matrix.shard }}	0s
android-x86 / ${{ matrix.name }}_${{ matrix.shard }}_test	0s
android-x86 / ${{ matrix.name }}_on_device_${{ matrix.shard }}	0s
android-arm64 / ${{ matrix.name }}_${{ matrix.shard }}_test	0s
android-arm64 / ${{ matrix.name }}_on_device_${{ matrix.shard }}	0s
upload-release-artifacts	11s
	3h 9m 54s

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