Consolidate cobalt toolchains for all platforms (#1235) #1919

Job	Run time
android-arm / initialize	43s
android-x86 / initialize	31s
android-arm64 / initialize	37s
android-x86 / docker-build-image	33s
android-x86 / docker-unittest-image	0s
android-arm64 / docker-build-image	34s
android-arm64 / docker-unittest-image	0s
android-arm / docker-unittest-image	0s
android-arm / docker-build-image	28s
android-x86 / x86_devel	20m 9s
android-x86 / x86_debug	20m 12s
android-x86 / x86_qa	7m 15s
android-x86 / x86_gold	6m 39s
android-arm64 / arm64_devel	20m 39s
android-arm64 / arm64_debug	19m 5s
android-arm64 / arm64_qa	7m 19s
android-arm64 / arm64_gold	7m 4s
android-arm / arm_devel	21m 44s
android-arm / arm_debug	18m 2s
android-arm / arm_qa	7m 17s
android-arm / arm_gold	8m 5s
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
android-arm / ${{ matrix.name }}_on_device_${{ matrix.shard }}	0s
android-arm / ${{ matrix.name }}_${{ matrix.shard }}_test	0s
	2h 46m 56s

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