before rB17bd5c9d4b1e it was "Remove selected objects from all groups"
- Dont see BKE_object_groups_clear checking if a collection is linked
to the current scene...
- Did that possibly change in rB713010bd7795?... Does not look like
it...
Unless I am missing something, this indeed removes selection from _all_
collections, so account for that in the operator description/idname.