Fixed up a unit test

Author: Evanthx

temporal-sdk/src/test/java/io/temporal/workflow/nexus/SignalOperationLinkingTest.java

@@ -57,7 +57,7 @@
  * in-memory test server does not implement this path so the class is skipped unless a real server
  * is in use.
  */
-public class SignalOperationLinkingTest extends BaseNexusTest {
+public class SignalOperationLinkingTest {
 
   private static final String MODE_SIGNAL_WITH_START = "signalWithStart";
   private static final String MODE_SIGNAL = "signal";
@@ -80,11 +80,6 @@ public static void requireExternalService() {
         SDKTestWorkflowRule.useExternalService);
   }
 
-  @Override
-  protected SDKTestWorkflowRule getTestWorkflowRule() {
-    return testWorkflowRule;
-  }
-
   // ── Tests ────────────────────────────────────────────────────────────────────────────────
 
   @Test
@@ -296,7 +291,6 @@ public String execute(String input) {
           Workflow.newNexusServiceStub(
               TestNexusServices.TestNexusService1.class,
               NexusServiceOptions.newBuilder()
-                  .setEndpoint(getEndpointName())
                   .setOperationOptions(
                       NexusOperationOptions.newBuilder()
                           .setScheduleToCloseTimeout(Duration.ofSeconds(30))