feat: Replace Controller role with Billing Admin role (#528)

Author: Ayushi3333

go/models/account_add_member_setup.go

@@ -3511,15 +3511,15 @@ definitions:
     properties:
       role:
         type: string
-        enum: ['Owner', 'Collaborator', 'Controller']
+        enum: ['Owner', 'Collaborator', 'Billing Admin']
       email:
         type: string
   accountUpdateMemberSetup:
     type: object
     properties:
       role:
         type: string
-        enum: ['Owner', 'Collaborator', 'Controller']
+        enum: ['Owner', 'Collaborator', 'Billing Admin']
       site_access:
         type: string
         enum: ['all', 'none', 'selected']