Add tests for POSIX file flush, truncate, and delete. #12015

Job	Run time
android-arm / initialize	43s
android-arm64 / initialize	50s
android-x86 / initialize	42s
android-x86 / docker-build-image	1m 24s
android-x86 / docker-unittest-image	0s
android-arm / docker-build-image	1m 49s
android-arm / docker-unittest-image	0s
android-arm64 / docker-build-image	1m 23s
android-arm64 / docker-unittest-image	0s
android-x86 / x86_devel	22m 57s
android-x86 / x86_debug	21m 58s
android-x86 / x86_qa	8m 26s
android-x86 / x86_gold	8m 5s
android-arm64 / arm64_devel	25m 44s
android-arm64 / arm64_debug	19m 38s
android-arm64 / arm64_qa	8m 14s
android-arm64 / arm64_gold	8m 10s
android-arm / arm_devel	20m 8s
android-arm / arm_debug	25m 24s
android-arm / arm_qa	8m 13s
android-arm / arm_gold	8m 18s
android-x86 / x86_on_device_0	58m 33s
android-x86 / x86_on_device_1	12m 36s
android-x86 / x86_on_device_2	31m 38s
android-x86 / x86_on_device_3	8m 19s
android-x86 / x86_on_device_black_box_test	30m 41s
android-x86 / ${{ matrix.name }}_${{ matrix.shard }}_test	0s
android-arm / ${{ matrix.name }}_${{ matrix.shard }}_test	0s
android-arm / arm_on_device_0	27m 7s
android-arm / arm_on_device_1	20m 55s
android-arm / arm_on_device_2	23m 37s
android-arm / arm_on_device_3	25m 37s
android-arm / arm_on_device_black_box_test	20m 28s
android-arm64 / ${{ matrix.name }}_${{ matrix.shard }}_test	0s
android-arm64 / arm64_on_device_0	32m 53s
android-arm64 / arm64_on_device_1	1h 31m 43s
android-arm64 / arm64_on_device_2	25m 29s
android-arm64 / arm64_on_device_3	26m 49s
android-arm64 / arm64_on_device_black_box_test	26m 49s
upload-release-artifacts	0s
	10h 55m 20s

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