Add missing mail keys to Projects

Ref T8216.

Auditors: btrahan

resources/sql/autopatches/20150515.project.mailkey.1.sql

···
+ALTER TABLE {$NAMESPACE}_project.project
+  ADD mailKey binary(20) NOT NULL;

resources/sql/autopatches/20150515.project.mailkey.2.php

···
+<?php
+
+$table = new PhabricatorProject();
+$conn_w = $table->establishConnection('w');
+$iterator = new LiskMigrationIterator($table);
+foreach ($iterator as $project) {
+  $id = $project->getID();
+
+  echo pht('Adding mail key for project %d...', $id);
+  echo "\n";
+
+  queryfx(
+    $conn_w,
+    'UPDATE %T SET mailKey = %s WHERE id = %d',
+    $table->getTableName(),
+    Filesystem::readRandomCharacters(20),
+    $id);
+}

src/applications/project/storage/PhabricatorProject.php

···
   protected $profileImagePHID;
   protected $icon;
   protected $color;
+  protected $mailKey;
 
   protected $viewPolicy;
   protected $editPolicy;
···
         'profileImagePHID' => 'phid?',
         'icon' => 'text32',
         'color' => 'text32',
+        'mailKey' => 'bytes20',
 
         // T6203/NULLABILITY
         // These are definitely wrong and should always exist.