Migrate KubePlus images from Google Container registry to Artifact registry

[devdattakulkarni]

Google Container Registry going away (March 2025). Need to start using Google Artifact Registry for KubePlus images.

See
https://cloud.google.com/artifact-registry/docs/transition/transition-from-gcr

After March 18, 2025, Container Registry will be shut down.
It will be great to complete the transition in next month or so.

[devdattakulkarni]

Update: This migration has been completed. Now KubePlus images are available in Google Artifact Repository. Over the course of coming months we will see if we face any issues while pushing/pulling images from Google Artifact Repository.