Revert "(UI) - Security Improvement, move to JWT Auth for Admin UI Sessions (#8995)"

This reverts commit 01a44a4e47.

litellm/proxy/auth/route_checks.py

@@ -1,5 +1,5 @@
 import re
-from typing import List, Optional, Set, Union
+from typing import List, Optional
 
 from fastapi import HTTPException, Request, status
 
@@ -225,9 +225,7 @@ class RouteChecks:
         return False
 
     @staticmethod
-    def check_route_access(
-        route: str, allowed_routes: Union[List[str], Set[str]]
-    ) -> bool:
+    def check_route_access(route: str, allowed_routes: List[str]) -> bool:
         """
         Check if a route has access by checking both exact matches and patterns