Stop setting WORKSPACE_COBALT in dind_build.sh #17553

Job	Run time
android-arm / initialize	1m 18s
chromium_android-arm64 / initialize	1m 16s
chromium_android-arm / initialize	1m 13s
android-arm64 / initialize	1m 14s
chromium_android-x86 / initialize	1m 15s
android-x86 / initialize	1m 12s
android-arm64 / docker-build-image	3m 53s
android-x86 / docker-build-image	4m 0s
chromium_android-arm / docker-build-image	3m 41s
chromium_android-arm64 / docker-build-image	4m 8s
chromium_android-x86 / docker-build-image	3m 59s
android-arm / docker-build-image	3m 59s
chromium_android-arm / arm_devel	25m 40s
chromium_android-arm / arm_qa	40m 6s
chromium_android-arm / arm_gold	40m 40s
android-arm64 / arm64_devel	35m 6s
android-arm64 / arm64_qa	38m 57s
android-arm64 / arm64_gold	38m 57s
android-x86 / x86_devel	25m 21s
android-x86 / x86_qa	29m 7s
android-x86 / x86_gold	28m 36s
chromium_android-x86 / x86_devel	25m 40s
chromium_android-x86 / x86_qa	27m 12s
chromium_android-x86 / x86_gold	27m 32s
android-arm / arm_devel	27m 34s
android-arm / arm_qa	39m 55s
android-arm / arm_gold	39m 24s
chromium_android-arm64 / arm64_devel	33m 53s
chromium_android-arm64 / arm64_qa	37m 10s
chromium_android-arm64 / arm64_gold	35m 19s
chromium_android-x86 / ${{ matrix.name }}_tests	0s
android-x86 / ${{ matrix.name }}_tests	0s
chromium_android-arm64 / ${{ matrix.name }}_tests	0s
android-arm64 / arm64_tests	1m 34s
android-arm / arm_tests	1m 28s
chromium_android-arm / ${{ matrix.name }}_tests	0s
	10h 30m 19s

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