feat: Add Enterprise Runners support

[micr0zz]

This is to add support for Enterprise level runners. Although GitHub supports applications at enterprise level, this type of authentication cannot be used for most of the requests (register runner/get runner, etc...).

WIP

[npalm]

@micr0zz thx, great you working on supporting enterprise level runners. I have not digged in detail in your PR. But quickly scanned the PR. I think we should introduce breaking changes to support enterprise. this to avoid configuration is getting super complex. What I mean here moving away from enable_enterprise_runners and enable_org.... And teplace this by an object or single string verable that indicates the runner level. for example runner_level and use a condition to allow 3 values.

Also wonderig what the status is of the PR. Still in WIP? In that case ca you mark the PR as draft.

[npalm]

@micr0zz I moved the PR to draft, it seems still in WIP. Are you still working on this?

[github-actions]

This pull request has been automatically marked as stale because it has not had activity in the last 30 days. It will be closed if no further activity occurs. Thank you for your contributions.