fix (接口测试): 修复提取参数支持变量_ALL的写法

--bug=1008331 --user=赵勇 【github#7849】Json 提取出数组，用${XX_ALL} 无法引用 https://www.tapd.cn/55049933/s/1074634

backend/src/main/java/io/metersphere/api/dto/definition/request/extract/MsExtract.java

@@ -125,6 +125,7 @@ public class MsExtract extends MsTestElement {
         extractor.setProperty(TestElement.GUI_CLASS, SaveService.aliasToClass("JSONPostProcessorGui"));
         extractor.setRefNames(extractJSONPath.getVariable());
         extractor.setJsonPathExpressions(extractJSONPath.getExpression());
+        extractor.setComputeConcatenation(true);
         if (extractJSONPath.isMultipleMatching()) {
             extractor.setMatchNumbers("-1");
         }