Remove all edge events

Summary:
Ref T5245. These were a bad idea.

We no longer need actors for edge edits either, so remove those. Generally, edges have fit into the policy model as pure/low-level infrastructure, and they do not have any policy or capability information in and of themselves.

Test Plan: `grep`

Reviewers: chad, btrahan, joshuaspence

Reviewed By: joshuaspence

Subscribers: epriestley

Maniphest Tasks: T5245

Differential Revision: https://secure.phabricator.com/D9840

resources/sql/patches/migrate-project-edges.php

@@ -22,7 +22,6 @@ foreach (new LiskMigrationIterator($table) as $proj) {
   $members = ipull($members, 'userPHID');
 
   $editor = new PhabricatorEdgeEditor();
-  $editor->setSuppressEvents(true);
   foreach ($members as $user_phid) {
     $editor->addEdge(
       $proj->getPHID(),