fix(argocd-image-updater): update RBAC namespaced role

[fad3t]

This PR add permissions for the image-updater Role when createClusterRole is set to false.
It is useful for namespaced deployments, where image-updater need to be able to read and update Applications in the same namespace.

Checklist:

• I have bumped the chart version according to versioning
• I have updated the documentation according to documentation
• I have updated the chart changelog with all the changes that come with this pull request according to changelog.
• Any new values are backwards compatible and/or have sensible default.
• I have signed off all my commits as required by DCO.
• My build is green (troubleshooting builds).

[yu-croco]

Hi @fad3t , thank you for your PR.
Please handle below, the one in your PR description. You can refer merged PRs if you want to know the examples.

I have updated the chart changelog with all the changes that come with this pull request according to changelog.

[yu-croco]

Thank you for your contribution. LGTM.