Avoid SyncOperationTimeoutTest spamming the test server (#2292)

Author: Quinn-With-Two-Ns

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

@@ -79,6 +79,12 @@ public OperationHandler<String, String> operation() {
       // Implemented inline
       return OperationHandler.sync(
           (ctx, details, name) -> {
+            // Simulate a long running operation
+            try {
+              Thread.sleep(2000);
+            } catch (InterruptedException e) {
+              throw new RuntimeException(e);
+            }
             throw new RuntimeException("failed to call operation");
           });
     }