Add tgadmin as an admin role to allow for Topgear editing all projects

https://topcoder.atlassian.net/browse/PROD-4152

Author: jmgasper

src/constants.js

@@ -65,9 +65,10 @@ export const USER_ROLE = {
   SOLUTION_ARCHITECT: 'Solution Architect',
   PROJECT_MANAGER: 'Project Manager',
   TOPCODER_USER: 'Topcoder User',
+  TG_ADMIN: 'tgadmin'
 };
 
-export const ADMIN_ROLES = [USER_ROLE.CONNECT_ADMIN, USER_ROLE.TOPCODER_ADMIN];
+export const ADMIN_ROLES = [USER_ROLE.CONNECT_ADMIN, USER_ROLE.TOPCODER_ADMIN, USER_ROLE.TG_ADMIN];
 
 export const MANAGER_ROLES = [
   ...ADMIN_ROLES,