Remove docs/code for unsupported AsyncPermissionsUpdateInterval
While looking at the documentation for potential spots that still need tweaking, I think I've found some traces of a currently not supported feature: the
asyncflag on the
- API documentation mentions it along with the
- Some test & config code is still existing about
API.AsyncPermissionsUpdateIntervaland its relationship with the previous point.
- Group's controller and arvados model still have some code related the
asyncparameter, but it seems to me that we don't really do anything with it anymore.
(copied from #18277#note-16)