Image-builder / image-puller rolebindings remain in the cluster

[dkwon17]

Description

How To Reproduce

When using the backup and restore functionality, old role bindings persist in the cluster, for example:

$ oc get rolebinding | grep workspace
devworkspace-default-rolebinding                                  Role/devworkspace-default-role                                   5d2h
devworkspace-image-builder-workspace459b0abd7c144687              ClusterRole/system:image-puller                                  4d2h
devworkspace-image-builder-workspacec2f9df1c974a4b84              ClusterRole/system:image-puller                                  4d2h
devworkspace-job-runner-workspace459b0abd7c144687-image-builder   ClusterRole/system:image-builder                                 4d

even though there is no workspace workspacec2f9df1c974a4b84 anymore on the cluster:

$ oc get dw
NAME                                  DEVWORKSPACE ID             PHASE     INFO
test-devworkspace-should-get-backup   workspace459b0abd7c144687   Stopped   Stopped

Expected behavior

These image-puller / image-builder role bindings should probably have an owner reference to their associated DevWorkspace, which would allow them to be garbage collected once the DevWorkspace is deleted.

Additional context