Change how we update the Helm Chart repo index.yaml

[scholzj]

Type of change

• Bugfix

Description

This PR addresses #8437 by changing how we manage and update the Helm Chart repository index.yaml. Today, the index.yaml is part of this repository. So when we do the release, we have to update the index.yaml with the new release before we tag the release and run the CI. But since the Helm Chart archive is built during the CI run from the Git sources, it is generated only after the index.yaml is updated. So as a result, the checksum does not match.

This PR removes the index.yaml from the operators repo and we will keep it only on the website where the repo is hosted. The index.yaml will be updated manually based on the Helm Chart archive from the CI build and thus will have the correct checksum. the necessary steps are described in the release docs.

This resolves #8437 - however, it does not fix the old signatures. It just makes sure the next one will be correct.

This PR also fixes two other minor issues:

• Fixes a bug introduced by Add systemtest to make all #8398 which breaks the release process
• Updates the list of maintainers in the Helm Chart

Checklist

• Update documentation
• Reference relevant issue(s) and close them after merging