Cherry pick PR #2205: Fix uninitialized variable append_ in class constructors #1615

Job	Run time
android-arm / initialize	32s
android-arm64 / initialize	29s
android-x86 / initialize	32s
android-x86 / docker-build-image	27s
android-x86 / docker-unittest-image	0s
android-arm64 / docker-build-image	29s
android-arm64 / docker-unittest-image	0s
android-arm / docker-build-image	25s
android-arm / docker-unittest-image	0s
android-x86 / x86_devel	17m 24s
android-x86 / x86_debug	16m 19s
android-x86 / x86_qa	7m 14s
android-x86 / x86_gold	8m 14s
android-arm64 / arm64_devel	19m 36s
android-arm64 / arm64_debug	25m 37s
android-arm64 / arm64_qa	7m 32s
android-arm64 / arm64_gold	7m 19s
android-arm / arm_devel	18m 54s
android-arm / arm_debug	27m 19s
android-arm / arm_qa	8m 25s
android-arm / arm_gold	7m 21s
android-x86 / ${{ matrix.name }}_${{ matrix.shard }}_test	0s
android-x86 / ${{ matrix.name }}_on_device_${{ matrix.shard }}	0s
android-x86 / on-host-unit-test-report	0s
android-arm64 / ${{ matrix.name }}_${{ matrix.shard }}_test	0s
android-arm64 / ${{ matrix.name }}_on_device_${{ matrix.shard }}	0s
android-arm64 / on-host-unit-test-report	0s
android-arm / ${{ matrix.name }}_${{ matrix.shard }}_test	0s
android-arm / ${{ matrix.name }}_on_device_${{ matrix.shard }}	0s
android-arm / on-host-unit-test-report	0s
	2h 54m 8s

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