Bring back role viewer in the new user management view

Summary

There used to be a role viewer in the user management that allows users to check user roles and access directly from the user management.

While there is a permission checker in place, the permission checker do not provide a higher level view on the user access/roles, it's project level view so users can't be sure if the specific user they are checking have access or roles in other projects in the JIRA instance.

For the ease of configuring user roles and access, please also include or return the role viewer feature in the user management.

As a workaround, the page can be accessed using the URL https://domain.atlassian.net/secure/admin/roles/ViewUserProjectRoles.jspa?name=admin