feat(helm): set GAR image defaults in controller chart values

[jimdaga]

What

Set default image.registry and image.repository in all 5 gecko controller Helm charts to point to the Konflux-published GAR image:

image:
  registry: us-docker.pkg.dev
  repository: gcp-hcp-commons/gcp-hcp-images/gecko-controllers

Previously these were CHANGE_ME placeholders that required the ArgoCD Application templates to override them.

Charts updated

• gecko-hc
• gecko-nodepool
• gecko-nodepool-vr-resolution
• gecko-placement
• gecko-version-resolution

Also updated _helpers.tpl validation error messages to reference the correct GAR path.

Why

Moves the image source of truth into the Helm charts (next to the code that produces it) instead of the infra repo's ArgoCD templates. This reduces duplication and makes the ArgoCD templates simpler — they only need to override image.tag.

Companion PR

openshift-online/gcp-hcp-infra#1164 removes the now-redundant image.registry and image.repository overrides from the ArgoCD Application templates.

Merge order: This PR should merge first, then the infra PR. If the infra PR merges first, ArgoCD will temporarily use the CHANGE_ME defaults and fail to deploy.

[openshift-ci]

Skipping CI for Draft Pull Request.
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[jimdaga]

/test all

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: cblecker, jimdaga

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