Fix pyright type checking errors in URL elicitation tests

Remove unnecessary isinstance check for CancelledElicitation since type
narrowing makes it redundant, and remove the unused import.

Author: cbcoutinho

tests/server/fastmcp/test_url_elicitation.py

@@ -3,7 +3,7 @@
 import pytest
 
 from mcp.client.session import ClientSession
-from mcp.server.elicitation import AcceptedUrlElicitation, CancelledElicitation, DeclinedElicitation
+from mcp.server.elicitation import AcceptedUrlElicitation, DeclinedElicitation
 from mcp.server.fastmcp import Context, FastMCP
 from mcp.server.session import ServerSession
 from mcp.shared.context import RequestContext
@@ -140,10 +140,9 @@ async def setup_credentials(ctx: Context[ServerSession, None]) -> str:
             return "Accepted"
         elif isinstance(result, DeclinedElicitation):
             return "Declined"
-        elif isinstance(result, CancelledElicitation):
-            return "Cancelled"
         else:
-            return "Unknown"
+            # Must be CancelledElicitation
+            return "Cancelled"
 
     async def elicitation_callback(context: RequestContext[ClientSession, None], params: ElicitRequestParams):
         return ElicitResult(action="accept")