Issue Summary

When a customer, who created a ticket, is removed as Reporter, they are still able to view and comment on Slack Notifications/Conversations.

Steps to Reproduce

 # Grant user XYZ customer permission in JSM. Ensure that the Slack notifications are received by the customer on their Slack Assist channel/App

1. Customer XYZ raises a new JSM Request from Customer Portal.
2. Now remove the customer XYZ from the JSM Request as Reporter. Ensure customer XYZ is not a Request Participant or Watcher.
3. Try accessing the JSM request in the Customer Portal.
   
4. Agent adds a public comment to the JSM Request
5. Customer XYZ tries to comment on the JSM Request from Slack.

Expected Results

• Customer XYZ should NOT be allowed to view the notification about any further updates in the JSM Request
• Customer XYZ should NOT be able to comment on the JSM Request

Actual Results

• Customer XYZ is able to view slack notifications in Assist bot about updates on the JSM Request
• Customer XYZ is able to send comments to the JSM Request.
  

Notes

 - 

Workaround

NA