refactor: Flatten role configs

[adwk67]

Description

Part of https://github.com/stackabletech/internal-issues/issues/167.

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Definition of Done Checklist

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Author

• Changes are OpenShift compatible
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• Code contains useful comments
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[siegfriedweber]

group_listener_name() could be renamed to webserver_role_group_listener_name() and return ListenerName instead of Option<ListenerName>.

[adwk67]

19c9136