Expose "parent task" and "subtask" relationships to "edge.search"

Summary: Ref T12337. This just fills out a couple more task relationships.

Test Plan: Viewed the edges in the Conduit console, queried for them.

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T12337

Differential Revision: https://secure.phabricator.com/D17465

src/applications/maniphest/edge/ManiphestTaskDependedOnByTaskEdgeType.php

@@ -11,6 +11,18 @@ final class ManiphestTaskDependedOnByTaskEdgeType extends PhabricatorEdgeType {
     return true;
   }
 
+  public function getConduitKey() {
+    return 'task.parent';
+  }
+
+  public function getConduitName() {
+    return pht('Parent Task');
+  }
+
+  public function getConduitDescription() {
+    return pht('The source object has the destination object as a parent.');
+  }
+
   public function getTransactionAddString(
     $actor,
     $add_count,

src/applications/maniphest/edge/ManiphestTaskDependsOnTaskEdgeType.php

@@ -16,6 +16,18 @@ final class ManiphestTaskDependsOnTaskEdgeType extends PhabricatorEdgeType {
     return true;
   }
 
+  public function getConduitKey() {
+    return 'task.subtask';
+  }
+
+  public function getConduitName() {
+    return pht('Subtask');
+  }
+
+  public function getConduitDescription() {
+    return pht('The source object has the destination object as a subtask.');
+  }
+
   public function getTransactionAddString(
     $actor,
     $add_count,