[Dashboard] Remove container-to-container drag functionality
[Dashboard] Remove container-to-container drag functionality

Demo: https://dev-eakuefner-5d5c3f94-dot-chromeperf.appspot.com/report?sid=361752eff4bb0bc09079a22d5e53682acfb2cc5cb74fe261674473f1ac41de35

BUG=catapult:#3418

Review-Url: https://codereview.chromium.org/2758033002

benschmaus/catapult,catapult-project/catapult,catapult-project/catapult,benschmaus/catapult,catapult-project/catapult-csm,benschmaus/catapult,catapult-project/catapult,benschmaus/catapult,catapult-project/catapult-csm,benschmaus/catapult,catapult-project/catapult-csm,benschmaus/catapult,sahiljain/catapult,catapult-project/catapult,catapult-project/catapult-csm,catapult-project/catapult,catapult-project/catapult-csm,catapult-project/catapult,sahiljain/catapult,sahiljain/catapult,sahiljain/catapult,sahiljain/catapult,catapult-project/catapult-csm,catapult-project/catapult,catapult-project/catapult-csm,benschmaus/catapult,sahiljain/catapult