Policy - convert Drydock query for repository to policy-based query

Summary: Ref T7094. Switch to OmnipotentUser policy-based query since this is usually done offline, etc.

Test Plan: pretty simple code change so I just have my fingers crossed while I am typing this

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin, epriestley

Maniphest Tasks: T7094

Differential Revision: https://secure.phabricator.com/D11655

src/applications/drydock/blueprint/DrydockWorkingCopyBlueprintImplementation.php

@@ -40,9 +40,10 @@ final class DrydockWorkingCopyBlueprintImplementation
         "Lease is missing required 'repositoryID' attribute.");
     }
 
-    // TODO: (T603) Figure out the interaction between policies and
-    // Drydock.
-    $repository = id(new PhabricatorRepository())->load($repository_id);
+    $repository = id(new PhabricatorRepositoryQuery())
+      ->setViewer(PhabricatorUser::getOmnipotentUser())
+      ->withIDs(array($repository_id))
+      ->executeOne();
 
     if (!$repository) {
       throw new Exception(