Outgoing webhook not impersonating user

Description:

With 4.4.0, responses to outgoing webhooks were broken entirely. Now with 4.4.1, it seems that they process the response properly, but the user the response is sent by is rocket.chat even with impersonation enabled

Steps to reproduce:

1. Create simple outgoing webhook with impersonation enabled and user set to root
2. trigger outgoing webhook
3. observe that the response is sent by rocket.chat

Expected behavior:

the response should be sent by the user who triggered the outgoing webhook

Actual behavior:

rocket.cat posts the response

Server Setup Information:

• Version of Rocket.Chat Server: 4.4.1
• Operating System: Docker
• Deployment Method: Docker
• Number of Running Instances: 1
• DB Replicaset Oplog:
• NodeJS Version:
• MongoDB Version: 4.4

Client Setup Information

• Desktop App or Browser Version: Latest Firefox/Edge tested
• Operating System: Windows 10

Relevant logs:

I did not see any errors in server logs or browser console logs

Reproduce the issue using an outgoing webhook with impersonation enabled and the user set to root, then inspect the outgoing webhook response-handling entry point. Done means the response is posted by the user who triggered the webhook rather than Rocket.Chat, with no server or browser errors.