Merge changes from topic "reapply_no_cgroup.rc" into main

* changes:
  Reapply "libprocessgroup: Combine all 3 ActivateControllers imple..."
  Reapply "libprocessgroup: Remove ACgroupController_getMaxActivati..."
  Reapply "libprocessgroup: Remove dependency on libcgrouprc"
  Reapply "libprocessgroup: Remove cgroup.rc file"