Diffusion: Display associated project tags on repository main page

Summary:
In Diffusion repositories, project tags associated with the repository are only shown on the "Manage > Edit Basic Information" page. (?)

Also display them in the repositories main page, alongside the existing tags (Status, Visibility).

Note that a project tag does not line-wrap, so a long project name can move the "Pattern Search" field out of the viewport on smaller screen widths due to T16287 and `.phui-tag-view {white-space: nowrap;}`.

Closes T15526

Test Plan:
1. Create a Diffusion repository; create some project tags
2. Go to http://phorge.localhost/diffusion/36/manage/ and select "Edit Basic Information"
3. Under "Tags", add several project tags, and "Save Changes"
4. Go to http://phorge.localhost/diffusion/36/ and see the project tags displayed next to the "Active/Disabled" and "Public/All Users/Custom Policy" tags.

Reviewers: O1 Blessed Committers, mainframe98

Reviewed By: O1 Blessed Committers, mainframe98

Subscribers: avivey, tobiaswiese, valerio.bozzolan, Matthew, Cigaryno

Maniphest Tasks: T15526

Differential Revision: https://we.phorge.it/D26735

src/applications/diffusion/controller/DiffusionRepositoryController.php

···
       }
     }
 
+    // Display associated projects as tags in repository browsing header
+    $project_phids = $repository->getProjectPHIDs();
+    if ($project_phids) {
+      $handles = id(new PhabricatorHandleQuery())
+        ->setViewer($viewer)
+        ->withPHIDs($project_phids)
+        ->execute();
+      $project_handles = array_select_keys(
+        $handles,
+        $project_phids);
+      foreach ($project_handles as $handle) {
+        $header->addTag($handle->renderTag());
+      }
+    }
+
     return $header;
   }
 

src/applications/diffusion/request/DiffusionRequest.php

···
       ->setViewer($viewer)
       ->withIdentifiers(array($identifier))
       ->needProfileImage(true)
+      ->needProjectPHIDs(true)
       ->needURIs(true);
 
     if ($need_edit) {