Support shared_runners_setting parameter in Groups creation API
Summary
This is a follow-up issue to !219879 (comment 3054391011).
The shared_runners_setting parameter is currently only supported when updating a Group, not during creation.
Proposal
Consider adding shared_runners_setting support to the Groups creation API by calling update_shared_runners in the Create service, similar to how it's handled in the Update service.
This could improve API consistency, though it needs further investigation to determine if it's worth the effort.