Get list of runners associated with specific group

Problem to solve

There is no API (or no documentation of one) for getting the list of runners for a specific group.

Intended users

Developers, DevOps Engineer, System Administrators

Further details

This API is available for project-specific runners, but does not appear to be available for group-specific runners.

Proposal

Add a GET request for a list of runners at the Group level.

Permissions and Security

This should be the same permissions as https://gitlab.com/help/api/runners.md#list-projects-runners

Documentation

The project-level documentation is at https://gitlab.com/help/api/runners.md#list-projects-runners

Links / references

https://gitlab.com/help/api/runners.md#list-projects-runners