Review fixes for openai-java-1.1:testing (open-telemetry#17566)

Co-authored-by: otelbot <197425009+otelbot@users.noreply.github.com>

Author: otelbot[bot]

instrumentation/openai/openai-java-1.1/testing/src/main/java/io/opentelemetry/instrumentation/openai/v1_1/AbstractEmbeddingsTest.java

@@ -31,12 +31,16 @@
 import io.opentelemetry.api.trace.Span;
 import io.opentelemetry.api.trace.SpanKind;
 import io.opentelemetry.context.Context;
+import io.opentelemetry.instrumentation.testing.internal.AutoCleanupExtension;
 import java.util.concurrent.CompletionException;
 import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.RegisterExtension;
 
 public abstract class AbstractEmbeddingsTest extends AbstractOpenAiTest {
   private static final String MODEL = "text-embedding-3-small";
 
+  @RegisterExtension static final AutoCleanupExtension cleanup = AutoCleanupExtension.create();
+
   protected final CreateEmbeddingResponse doEmbeddings(EmbeddingCreateParams request) {
     return doEmbeddings(request, getClient(), getClientAsync());
   }
@@ -218,6 +222,8 @@ void connectionError() {
                 .apiKey("testing")
                 .maxRetries(0)
                 .build());
+    cleanup.deferCleanup(client::close);
+    cleanup.deferCleanup(clientAsync::close);
 
     EmbeddingCreateParams request =
         EmbeddingCreateParams.builder()

instrumentation/openai/openai-java-1.1/testing/src/main/java/io/opentelemetry/instrumentation/openai/v1_1/OpenAi1TestHelper.java

@@ -30,7 +30,8 @@ public ChatCompletionTool chatCompletionTool(FunctionDefinition functionDefiniti
   @Override
   public MessageToolCallBuilder messageToolCallBuilder() {
     return new MessageToolCallBuilder() {
-      final ChatCompletionMessageToolCall.Builder builder = ChatCompletionMessageToolCall.builder();
+      private final ChatCompletionMessageToolCall.Builder builder =
+          ChatCompletionMessageToolCall.builder();
 
       @Override
       public MessageToolCallBuilder id(String id) {
@@ -57,7 +58,7 @@ public FunctionBuilder messageToolCallFunctionBuilder() {
   }
 
   private static class FunctionBuilderImpl implements FunctionBuilder {
-    final ChatCompletionMessageToolCall.Function.Builder builder =
+    private final ChatCompletionMessageToolCall.Function.Builder builder =
         ChatCompletionMessageToolCall.Function.builder();
 
     @Override