Volume-Snapshot-Mover uses hard-coded upstream image for DummyPodImage

Description of problem:

in disconnected cluster we must use digest to pull images.

Howvere some pods trying to pull image with tag specifcally ythis one:

quay.io/konveyor/rsync-transfer:latest

the image is hardcoded here https://github.com/migtools/volume-snapshot-mover/blob/02f8637264d9e902c4676616a359d7cb6d0e33f4/controllers/common.go#L29

vsb pods are creating in error state Failed to pull image "quay.io/konveyor/r

sync-transfer:latest": rpc error: code = Unknown desc = pinging container registry quay.io: Get "https://quay.io/v2/": Forbidden
 Warning  Failed                  17m (x4 over 18m)     kubelet                          Error: ErrImagePull
 because it cannot pull the image with that tag latest.

Version-Release number of selected component (if applicable):

1.2.0-79

see thread for refernce https://redhat-internal.slack.com/archives/C0144ECKUJ0/p1685631636273899

Steps to Reproduce:
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Actual results:

Expected results:

Additional info: