Allow images to be overridden in CRD

[chainlink]

We have inputs in the CRD for image repository / tag, but we don't use those values if they are specified in the CRD (instead using the values in images.json) I believe the ordering should be

1. Use image and tag values from the crd if specified
2. Fall back on the images.json values

[rkpattnaik780]

Hello @chainlink
If this issue still exists, can I be assigned this one?