WIP: Issue #26426 Drafting a solution for the retrieval of runners that belong to subgroups for the owner of the parent group

What does this MR do?

This MR implements the group ownership inheritance so that information for runners belonging to children groups can be obtained by the owners of the parent projects through the API

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• Documentation created/updated or follow-up review issue created
• Code review guidelines
• Merge request performance guidelines
• Style guides
• Database guides
• Separation of EE specific content