Update the provider_id validation to fix the error message displayed … (#15466)

Co-authored-by: Kyle Chang <kylechang@91app.com>

api/models/model.py

                 provider_id = tool.get("provider_id", "")
 
                 if provider_type == ToolProviderType.API.value:
-                    if provider_id not in existing_api_providers:
+                    if uuid.UUID(provider_id) not in existing_api_providers:
                         deleted_tools.append(
                             {
                                 "type": ToolProviderType.API.value,