Add GPU tests to the release-master-blocking dashboard.
Add GPU tests to the release-master-blocking dashboard.

Their counterparts are already in the release-1.7-blocking dashboard.

This is related to kubernetes/kubernetes#47192.

GoogleCloudPlatform/testgrid,GoogleCloudPlatform/testgrid,GoogleCloudPlatform/testgrid,GoogleCloudPlatform/testgrid,GoogleCloudPlatform/testgrid,GoogleCloudPlatform/testgrid