fix(接口管理): 修复场景导入系统请求问题

--bug=1047839 --user=郭雨琦 https://www.tapd.cn/55049933/bugtrace/bugs/view/1155049933001047839

backend/services/api-test/src/main/java/io/metersphere/api/service/scenario/ApiScenarioSelectAssociateService.java

@@ -49,12 +49,15 @@ public class ApiScenarioSelectAssociateService {
                 case "SCENARIO":
                     List<ApiScenarioStepDTO> apiScenarioStepDTOs = handleApiScenarioData(request.get(key));
                     steps.addAll(apiScenarioStepDTOs);
+                    break;
                 case "CASE":
                     List<ApiScenarioStepDTO> apiCaseStepDTOs = handleApiCaseData(request.get(key));
                     steps.addAll(apiCaseStepDTOs);
+                    break;
                 default:
                     List<ApiScenarioStepDTO> apiStepDTOs = handleApiData(request.get(key));
                     steps.addAll(apiStepDTOs);
+                    break;
             }
         }
         return steps;