[feature] migrate docker images to ghcr

[mahdikhashan]

What this PR does / why we need it:

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #2519

Checklist:

• Docs included if any changes are user facing

[google-oss-prow]

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[mahdikhashan]

/cc @kubeflow/wg-automl-leads @Electronic-Waste @varodrig

PTAL!

[mahdikhashan]

please refer to this published image on my own user, https://github.com/mahdikhashan/katib/pkgs/container/katib-conformance

and this temp workflow where i disabled release branch check: https://github.com/mahdikhashan/katib/actions/runs/13565650050/job/37918014229

[Electronic-Waste]

@mahdikhashan Thanks for this! Just one comment for you.

[Electronic-Waste]

I think, the naming convention in GHCR should be ghcr.io/<org name or user name>/....

So the second item between /s might need to be changed to kubeflow

[Electronic-Waste]

And maybe we should also fix the image reference under manifests/, examples/, pkg/, test/ and hack/.

[mahdikhashan]

And maybe we should also fix the image reference under manifests/, examples/, pkg/, test/ and hack/.

tnx for your review Shao, will address them asap.