In Differential, render status for any active Drydock repository operation, not just "Land" operations

Summary:
See PHI18. Third parties can currently define other types of Drydock operations (like "Merge Check" or "Cherry-Pick") but we won't show them in the UI.

This is a simple change which improves third-party support for now. These kinds of operations generally make sense in the upstream, but the pathways to support are longer.

Test Plan:
  - Verified that there are no other types of repository operation which we'd want to exclude in the upstream today by reviewing the "Repository Operation" subclasses.
  - Will click some buttons in production to make sure this works.

Reviewers: chad

Reviewed By: chad

Differential Revision: https://secure.phabricator.com/D18276

src/applications/differential/controller/DifferentialRevisionViewController.php

@@ -1051,14 +1051,14 @@ final class DifferentialRevisionViewController extends DifferentialController {
       return null;
     }
 
+    // NOTE: The upstream currently supports only "Land" operations, but
+    // third parties have other operations (see PHI18). For now, we show any
+    // operation that exists. We'll refine this in the future.
+
     $operations = id(new DrydockRepositoryOperationQuery())
       ->setViewer($viewer)
       ->withObjectPHIDs(array($revision->getPHID()))
       ->withIsDismissed(false)
-      ->withOperationTypes(
-        array(
-          DrydockLandRepositoryOperation::OPCONST,
-        ))
       ->execute();
     if (!$operations) {
       return null;