Create Github workflow for Release of kubernetes/controller

[morri-son]

Description
Similar as for the CLI, we require a Github workflow to create releases for the controllers.

The workflow should orchestrate alle required actions:

• compute RC and final versions
• build the controller and all its artifacts (including the helm chart)
• create RC
• promote RC to final relase
  • promote OCI image to final tag (and latest), attestations are kept stable and valid
  • Package Helm chart again using final version, as pure promote does not work due to Helm specifics.
• handle release notes

Ideally we can re-use large parts of the orchestration workflow for the cli, especially all helper scripts.

Out of Scope

• Create a workflow that covers the controller build. This is covered in Create GH workflow to build all controller artifacts (OCI image and Helm chart) #881

Done Criteria

• Workflow exists
• Code has been reviewed by other team members
• Analysis of existing tests (Unit and Integration)
• Unit Tests created for new code or existing Unit Tests updated
• Integration Test Suite updated (includes deletion of existing unnecessary Integration Test and/or creation of new ones if required)
• Enduser Documentation updated (if applicable)
• Internal technical Documentation created/updated (if applicable)
• Successful demonstration in Review