Description of problem:

When using the KFNBC spawner, the selected image will get reset to the `lastSelectedImage` (or minimal if none has been spawned yet) every few seconds.
This seems to happen every time the dashboard GETs the `odh-dashboard-config` resource.

Prerequisites (if any, like setup, operators/versions):

Steps to Reproduce

1. Install RHODS 1.15
2. Enable KFNBC
3. Go to spawner page
4. Select an image other than the one selected by default
5. wait for a few seconds (open the network tab of the browser dev tools if you want)
6. user img selection will reset back to the default image (in the network tab you should see a successful GET of the "config" resource, among other things)

Actual results:

selected image gets reset

Expected results:

User selection does not get reset

Reproducibility (Always/Intermittent/Only Once):

always

Build Details:

latest 1.15 RC

Workaround:

Spawn quicker than the dashboard GETs the resource

Additional info: