Remove unused enum definition (#36568)

Author: admayber

specification/search/data-plane/Azure.Search/preview/2025-08-01-preview/searchservice.json

@@ -2833,24 +2833,6 @@
       },
       "description": "The AI model to be used for query planning."
     },
-    "KnowledgeAgentOutputOptimization": {
-      "type": "string",
-      "enum": [
-        "attemptBypassModel"
-      ],
-      "x-ms-enum": {
-        "name": "KnowledgeAgentOutputOptimization",
-        "modelAsString": true,
-        "values": [
-          {
-            "value": "attemptBypassModel",
-            "name": "AttemptBypassModel",
-            "description": "Attempt to avoid a model call by issuing the most recent chat message as a direct query."
-          }
-        ]
-      },
-      "description": "Procedural optimizations the agent should perform during retrieval."
-    },
     "KnowledgeAgentAzureOpenAIModel": {
       "type": "object",
       "x-ms-discriminator-value": "azureOpenAI",