update mock EIS authorization response

Author: brendan-jugan-elastic

x-pack/plugin/inference/qa/inference-service-tests/src/javaRestTest/java/org/elasticsearch/xpack/inference/MockElasticInferenceServiceAuthorizationServer.java

@@ -41,6 +41,10 @@ public void enqueueAuthorizeAllModelsResponse() {
                     {
                       "model_name": "elser-v2",
                       "task_types": ["embed/text/sparse"]
+                    },
+                    {
+                      "model_name": "rerank-v1",
+                      "task_types": ["rerank/text/text-similarity"]
                     }
                 ]
             }