(core) have user.Name come from database for websocket users

Summary: The name of a user for actions made using a websocket until now could be inconsistent with that seen by other means. This draws the name from the database, rather than from session information that may have been cached from an identity provider.

Test Plan: added test

Reviewers: dsagal

Reviewed By: dsagal

Subscribers: dsagal

Differential Revision: https://phab.getgrist.com/D3379

app/server/lib/FlexServer.ts

@@ -819,12 +819,13 @@ export class FlexServer implements GristServer {
   }
 
   public addComm() {
-    if (this._check('comm', 'start')) { return; }
+    if (this._check('comm', 'start', 'homedb')) { return; }
     this._comm = new Comm(this.server, {
       settings: this.settings,
       sessions: this._sessions,
       hosts: this._hosts,
       httpsServer: this.httpsServer,
+      dbManager: this._dbManager,
     });
   }
   /**