Replace CopyOnWriteArraySet with synchronized List for steps

Change stepExecutions collection in `JobExecutionEvent` from
`CopyOnWriteArraySet` to `Collections.synchronizedList(new ArrayList<>())`
to preserve the order of step executions. Sets do not maintain insertion
order, which can cause issues when processing or displaying step execution
history in the correct sequence.

This change ensures that step executions are stored and retrieved in the
order they were added, which is critical for understanding job execution
flow and debugging batch processes.

Re-enable previously disabled tests that verify step execution handling
and auto-configuration behavior. Remove unused imports and bean
definitions that are no longer needed after the Spring Batch 6.x
migration.

Author: cppwfs

spring-cloud-task-batch/src/test/java/org/springframework/cloud/task/batch/configuration/TaskJobLauncherAutoConfigurationTests.java

@@ -16,7 +16,6 @@
 
 package org.springframework.cloud.task.batch.configuration;
 
-import org.junit.jupiter.api.Disabled;
 import org.junit.jupiter.api.Test;
 
 import org.springframework.batch.core.configuration.JobRegistry;
@@ -31,7 +30,6 @@
 import org.springframework.boot.autoconfigure.AutoConfigurations;
 import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
 import org.springframework.boot.batch.autoconfigure.BatchAutoConfiguration;
-import org.springframework.boot.batch.autoconfigure.BatchProperties;
 import org.springframework.boot.batch.autoconfigure.JobLauncherApplicationRunner;
 import org.springframework.boot.jdbc.autoconfigure.EmbeddedDataSourceConfiguration;
 import org.springframework.boot.test.context.assertj.AssertableApplicationContext;
@@ -99,7 +97,6 @@ private void validateJobNames(AssertableApplicationContext context, String jobNa
 		assertThat(names).isEqualTo(jobNames);
 	}
 
-	@Disabled
 	@Test
 	public void testAutoBuiltDataSourceWithTaskJobLauncherCLRDisabled() {
 		this.contextRunner.run(context -> {
@@ -133,11 +130,6 @@ JobRegistry jobRegistry() {
 			return new MapJobRegistry();
 		}
 
-		@Bean
-		BatchProperties batchProperties() {
-			return new BatchProperties();
-		}
-
 	}
 
 }

spring-cloud-task-stream/src/main/java/org/springframework/cloud/task/batch/listener/support/JobExecutionEvent.java

@@ -24,7 +24,6 @@
 import java.util.List;
 import java.util.Set;
 import java.util.concurrent.CopyOnWriteArrayList;
-import java.util.concurrent.CopyOnWriteArraySet;
 
 import org.springframework.batch.core.BatchStatus;
 import org.springframework.batch.core.Entity;
@@ -44,7 +43,7 @@ public class JobExecutionEvent extends Entity {
 
 	private JobInstanceEvent jobInstance;
 
-	private Collection<StepExecutionEvent> stepExecutions = new CopyOnWriteArraySet<>();
+	private Collection<StepExecutionEvent> stepExecutions = Collections.synchronizedList(new ArrayList<>());
 
 	private BatchStatus status = BatchStatus.STARTING;
 

spring-cloud-task-stream/src/main/java/org/springframework/cloud/task/batch/listener/support/StepExecutionEvent.java

@@ -107,7 +107,6 @@ public StepExecutionEvent(StepExecution stepExecution) {
 		this.rollbackCount = stepExecution.getRollbackCount();
 		this.writeCount = stepExecution.getWriteCount();
 		this.writeSkipCount = stepExecution.getWriteSkipCount();
-
 	}
 
 	/**

spring-cloud-task-stream/src/test/java/org/springframework/cloud/task/batch/listener/JobExecutionEventTests.java

@@ -25,7 +25,6 @@
 import java.util.Set;
 
 import org.junit.jupiter.api.BeforeEach;
-import org.junit.jupiter.api.Disabled;
 import org.junit.jupiter.api.Test;
 
 import org.springframework.batch.core.BatchStatus;
@@ -74,7 +73,6 @@ public class JobExecutionEventTests {
 
 	private JobInstance jobInstance;
 
-	//
 	@BeforeEach
 	public void setup() {
 		this.jobInstance = new JobInstance(JOB_INSTANCE_ID, JOB_NAME);
@@ -119,7 +117,6 @@ public void testJobParameters() {
 				new JobParameterEvent(PARAMETERS[3]));
 	}
 
-	@Disabled
 	@Test
 	public void testStepExecutions() {
 		JobExecution jobExecution;