feat: 测试用例关联多个测试

backend/src/main/java/io/metersphere/track/request/testcase/EditTestCaseRequest.java

@@ -16,4 +16,5 @@ public class EditTestCaseRequest extends TestCaseWithBLOBs {
      * 复制测试用例后，要进行复制的文件Id list
      */
     private List<String> fileIds = new ArrayList<>();
+    private List<List<String>> selected = new ArrayList<>();
 }