Add tests for POSIX file flush, truncate, and delete. #11965

Job	Run time
android-x86 / initialize	42s
android-arm64 / initialize	46s
android-arm / initialize	44s
android-x86 / docker-build-image	1m 22s
android-x86 / docker-unittest-image	0s
android-arm64 / docker-build-image	1m 20s
android-arm64 / docker-unittest-image	0s
android-arm / docker-build-image	1m 20s
android-arm / docker-unittest-image	0s
android-x86 / x86_devel	21m 25s
android-x86 / x86_debug	17m 37s
android-x86 / x86_qa	7m 55s
android-x86 / x86_gold	7m 57s
android-arm64 / arm64_devel	25m 49s
android-arm64 / arm64_debug	19m 35s
android-arm64 / arm64_qa	8m 4s
android-arm64 / arm64_gold	8m 27s
android-arm / arm_devel	20m 8s
android-arm / arm_debug	19m 10s
android-arm / arm_qa	7m 56s
android-arm / arm_gold	7m 33s
android-arm / ${{ matrix.name }}_${{ matrix.shard }}_test	0s
android-arm / arm_on_device_0	34m 55s
android-arm / arm_on_device_1	24m 52s
android-arm / arm_on_device_2	26m 13s
android-arm / arm_on_device_3	30m 58s
android-arm / arm_on_device_black_box_test	32m 53s
android-x86 / x86_on_device_0	56m 43s
android-x86 / ${{ matrix.name }}_${{ matrix.shard }}_test	0s
android-x86 / x86_on_device_1	41m 26s
android-x86 / x86_on_device_2	49m 37s
android-x86 / x86_on_device_3	48m 36s
android-x86 / x86_on_device_black_box_test	43m 32s
android-arm64 / ${{ matrix.name }}_${{ matrix.shard }}_test	0s
android-arm64 / arm64_on_device_0	37m 39s
android-arm64 / arm64_on_device_1	22m 28s
android-arm64 / arm64_on_device_2	26m 29s
android-arm64 / arm64_on_device_3	28m 34s
android-arm64 / arm64_on_device_black_box_test	25m 31s
upload-release-artifacts	0s
	11h 48m 16s

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