Fix checkstyle errors in inference plugin

Author: timgrein

x-pack/plugin/inference/src/test/java/org/elasticsearch/xpack/inference/services/elastic/ElasticInferenceServiceTests.java

@@ -680,9 +680,11 @@ public void testUnifiedCompletionInfer_PropagatesProductUseCaseHeader() throws I
             // Mock a successful streaming response
             String responseJson =
                 """
-                    data: {"id":"1","object":"completion","created":1677858242,"model":"my-model-id","choices":[{"finish_reason":null,"index":0,"delta":{"role":"assistant","content":"Hello"}}]}
+                    data: {"id":"1","object":"completion","created":1677858242,"model":"my-model-id",
+                    "choices":[{"finish_reason":null,"index":0,"delta":{"role":"assistant","content":"Hello"}}]}
 
-                    data: {"id":"2","object":"completion","created":1677858242,"model":"my-model-id","choices":[{"finish_reason":"stop","index":0,"delta":{"content":" world!"}}]}
+                    data: {"id":"2","object":"completion","created":1677858242,"model":"my-model-id",
+                    "choices":[{"finish_reason":"stop","index":0,"delta":{"content":" world!"}}]}
 
                     data: [DONE]