Modernize ReleephProjectQuery ordering/paging

Summary: Ref T7803. Continue removing implementations of getPagingColumn() and getReversePaging().

Test Plan: Browsed and paged through Releeph projects, Maniphest tasks, Diffusion repositories.

Reviewers: btrahan

Reviewed By: btrahan

Subscribers: epriestley

Maniphest Tasks: T7803

Differential Revision: https://secure.phabricator.com/D12358

src/applications/maniphest/query/ManiphestTaskQuery.php

@@ -949,14 +949,6 @@ final class ManiphestTaskQuery extends PhabricatorCursorPagedPolicyAwareQuery {
     return array_mergev($phids);
   }
 
-  private function loadCursorObject($id) {
-    $results = id(new ManiphestTaskQuery())
-      ->setViewer($this->getPagingViewer())
-      ->withIDs(array((int)$id))
-      ->execute();
-    return head($results);
-  }
-
   protected function getPagingValue($result) {
     $id = $result->getID();