DLSV2-513 Create a nominated supervisor role #982
                
     Merged
            
            
          
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JIRA link
https://hee-dls.atlassian.net/browse/DLSV2-513
Description
Added migration, updated tests, views, controller methods and helpers.
Screenshots
Administrator/EditAdminRoles.cshtml
Delegates/PromoteToAdmin/Index.cshtml
Developer checks
I have:
Supervisor/MyStaffList.cshtmlwhen user is nominated supervisor.Supervisor/DelegateProfileAssessments.cshtmlwhen user is nominated supervisor.Administrator/EditAdminRoles.cshtml.Delegates/PromoteToAdmin/Index.cshtml.