Allow Request Participants role / group to be added to Issue Security Schemes and Project Permissions

Summary

When using issue security in a Service Desk project, Request Participants are unable to view the issue at all

Environment

Cloud
Server

Steps to Reproduce

1. Create a new Service Desk project
2. Create a new Issue Security Scheme
3. Create a new ticket and assign it the Issue Security level in your Issue Security Scheme
4. Add a second user as a Request Participant on the ticket that is not part of the Issue Security Scheme
5. That user should receive an email
6. Click on the link in the email

Expected Results

The user should be able to view the ticket they are a Request Participant on

Actual Results

The user can only see the main portal and not the issue he/she has been added as a Request Participant on

Notes

In this use case, it would be helpful if there was a way to add a Request Participants group / role to the Issue Security Scheme so that when people are invited to partake in a ticket, they are able to see the ticket within the Service Desk project.

The same issue applies to project permissions, as the field "Request Participants" can't be associated to any project permission.