revert change in EventProcessor

Author: zhongkechen

sdk-testing/src/main/java/software/amazon/lambda/durable/testing/local/EventProcessor.java

@@ -45,7 +45,7 @@ private Event buildStepEvent(Event.Builder builder, OperationUpdate update, Oper
                                 .retryDetails(buildRetryDetails(operation))
                                 .build())
                         .build();
-            case FAIL, RETRY ->
+            case FAIL ->
                 builder.eventType(STEP_FAILED)
                         .stepFailedDetails(StepFailedDetails.builder()
                                 .error(EventError.builder()
@@ -54,6 +54,10 @@ private Event buildStepEvent(Event.Builder builder, OperationUpdate update, Oper
                                 .retryDetails(buildRetryDetails(operation))
                                 .build())
                         .build();
+            case RETRY ->
+                builder.eventType(STEP_STARTED)
+                        .stepStartedDetails(StepStartedDetails.builder().build())
+                        .build();
             default -> throw new IllegalArgumentException("Unsupported step action: " + update.action());
         };
     }