fix: Use correct default image values

[lindhe]

Description

• Use 12.0.10 instead of v12.0.10 in appVersion, so it's compliant with the tag of the default image.
• Fix typo ghrc.io --> ghcr.io
• Fix typo where image name was part of the tag.
• DRY: Unset the tag value, so we default to using appVersion.
• Unset deprecated image fields.

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[lindhe]

In https://github.com/inveniosoftware/helm-invenio/actions/runs/14500405731 the linting failed because of too few spaces before a comment. That's not part of Helm lint, is there also some YAML linting included here? 🤔 Any idea how to best formalize the linting rules so one can test them locally before pushing?

[egabancho]

The CI action uses the chart-testing tool behind the scenes. In particular, ct lint which

Run 'helm lint', version checking, YAML schema validation on 'Chart.yaml', YAML linting on 'Chart.yaml' and 'values.yaml', and maintainer validation