Time to first response SLA stops ticking when reporter is updated and/or if the ticket contains attachment

Issue Summary

Time to first response SLA stops ticking when reporter is updated and/or if the ticket contains attachment

Steps to Reproduce

1. Create a JSD project 
2. Add some customer and agent
3. Don't make any changes to the project configuration, leave it to the default settings.
   • 
4. Create a new ticket as customer via portal and add the attachment at the same time
5. Once the ticket is created, change the reporter to any other user (or even anonymous)

Expected Results

Time to first response SLA is still ticking

Actual Results

Time to first response SLA stops ticking

Notes

• It works fine if the ticket is created without attachment.
• It affects tickets created via portal, email and API
• It also affects if an agent raise a request with an attachment on behalf of a customer

Workaround

None