Cherry pick PR #2586: Add telemetry for `SourceBuffer.appendBuffer` #1863

Job	Run time
android-arm / initialize	36s
android-arm64 / initialize	36s
android-x86 / initialize	29s
android-x86 / docker-build-image	31s
android-x86 / docker-unittest-image	0s
android-arm64 / docker-build-image	58s
android-arm64 / docker-unittest-image	0s
android-arm / docker-build-image	1m 2s
android-arm / docker-unittest-image	0s
android-x86 / x86_devel	16m 57s
android-x86 / x86_debug	18m 33s
android-x86 / x86_qa	7m 13s
android-x86 / x86_gold	7m 33s
android-arm64 / arm64_devel	18m 51s
android-arm64 / arm64_debug	19m 3s
android-arm64 / arm64_qa	7m 51s
android-arm64 / arm64_gold	7m 47s
android-arm / arm_devel	17m 8s
android-arm / arm_debug	24m 9s
android-arm / arm_qa	8m 11s
android-arm / arm_gold	8m 13s
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 45m 41s

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