Remove `CommandRequest::Args` #120

Job	Run time
build-installer-iso-job	2m 35s
build-metapackage-deb-job	6m 47s
build-uboot-qemu-job	3m 24s
build-cuttlefish-deb-job / build-arm64-cuttlefish-deb-job	1h 46m 27s
test-install-metapackage-deb-job	8m 46s
test-install-cuttlefish-deb-job	8m 48s
	2h 16m 47s

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