[FEAT] - Remove obsolete global.greenhouse OptionValues

[uwe-mayer]

Priority

None

User Story

Our Plugin controller injects default option values into the Plugin as helm values. Some of them are not used and cluttering the spec.

Description

We want to remove fields we agree on that are not needed anymore.
Revisit global.greenhouse OptionValues

- name: global.greenhouse.clusterNames
  - name: global.greenhouse.teamNames
  - name: global.greenhouse.organizationName
  - name: global.greenhouse.clusterName
  - name: global.greenhouse.metadata.region
  - name: global.greenhouse.baseDomain

Acceptance Criteria

• agreed upon values are not injected into Plugin OptionValues anymore
• [Existing documentation](https://cloudoperators.github.io/greenhouse/docs/contribute/plugins/#:~:text=Plugin%20Definition%20(plugindefinition.yaml,of%20this%20Plugin%20instance) is revisited. Default injected values need to find a more prominent place in the docs and reflect the reduced set.

Reference Issues

No response