fix(测试跟踪): 修复复制测试计划，有时会出现用例条数自动增加的缺陷

--bug=1020493 --user=王孝刚 【测试计划】GitHub#20356复制测试计划，有时会出现用例条数自动增加的情况
https://www.tapd.cn/55049933/s/1346372

test-track/backend/src/main/java/io/metersphere/plan/service/TestPlanService.java

@@ -1156,6 +1156,7 @@ public class TestPlanService {
             if (!CollectionUtils.isEmpty(testPlanTestCases)) {
                 Long nextTestCaseOrder = ServiceUtils.getNextOrder(targetPlanId, extTestPlanTestCaseMapper::getLastOrder);
                 for (TestPlanTestCase testCase : testPlanTestCases) {
+                    if (BooleanUtils.isNotTrue(testCase.getIsDel())) {
                         TestPlanTestCaseWithBLOBs testPlanTestCase = new TestPlanTestCaseWithBLOBs();
                         testPlanTestCase.setId(UUID.randomUUID().toString());
                         testPlanTestCase.setPlanId(targetPlanId);
@@ -1172,6 +1173,7 @@ public class TestPlanService {
                         testCaseMapper.insert(testPlanTestCase);
                     }
                 }
+            }
             sqlSession.flushStatements();
 
             Set<String> serviceIdSet = DiscoveryUtil.getServiceIdSet();