tests(e2e): re-enable e2e tests on Oracular (#1034)

We discussed this yesterday and came to the conclusion that it's better
to run the Oracular cell even if an image template doesn't exist yet. It
will fail the job, but this way we will notice when a template is
finally built (the job will turn green), and no action will be required
of the team.

.github/workflows/e2e-tests.yaml

@@ -49,11 +49,6 @@ jobs:
                   continue
               fi
 
-              # TODO remove this once we have Docker & Azure images for Oracular
-              if [ "${r}" = "oracular" ]; then
-                  continue
-              fi
-
               if [ -n "${releases}" ]; then
                   releases="${releases}, "
               fi