fix(测试跟踪): 自定义字段是多选类型，导入时字段格式输入错误，提示需优化

【【测试跟踪】自定义字段是多选类型，导入时字段格式输入错误，提示需优化】https://www.tapd.cn/55049933/bugtrace/bugs/view?bug_id=1155049933001016133

backend/src/main/java/io/metersphere/track/validate/AbstractCustomFieldValidator.java

@@ -60,7 +60,7 @@ public abstract class AbstractCustomFieldValidator {
             }
             return JSONArray.parseArray(value, String.class);
         } catch (Exception e) {
-            CustomFieldValidateException.throwException(String.format(Translator.get("custom_field_required_tip"), name));
+            CustomFieldValidateException.throwException(String.format(Translator.get("custom_field_array_tip"), name));
         }
         return new ArrayList<>();
     }