Update conformance-gce dashboard
Update conformance-gce dashboard

For two reasons:

- I put 1.14 jobs in -all and forgot about -gce
- Drop the alerts for now, that alias does not exist anymore, and it's
  unclear that was the right owner to begin with

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