fix(接口测试): 变量断言期望值中带有特殊符号，断言失败

--bug=1037889 --user=陈建星 【项目环境】环境管理-断言中添加变量断言-断言匹配包含json格式时，断言错误 https://www.tapd.cn/55049933/s/1497938

backend/services/api-test/src/main/java/io/metersphere/api/parser/jmeter/processor/assertion/VariableAssertionConverter.java

@@ -8,6 +8,7 @@ import io.metersphere.plugin.api.dto.ParameterConfig;
 import io.metersphere.sdk.constants.MsAssertionCondition;
 import org.apache.commons.lang3.BooleanUtils;
 import org.apache.commons.lang3.StringUtils;
+import org.apache.commons.text.StringEscapeUtils;
 import org.apache.jmeter.assertions.JSR223Assertion;
 import org.apache.jorphan.collections.HashTree;
 
@@ -75,7 +76,7 @@ public class VariableAssertionConverter extends AssertionConverter<MsVariableAss
                 variableValue = vars.get("%s");
                 expectation = "%s";
                 flag = true;
-                """, variableAssertionItem.getVariableName(), variableAssertionItem.getExpectedValue());
+                """, StringEscapeUtils.escapeJava(variableAssertionItem.getVariableName()), StringEscapeUtils.escapeJava(variableAssertionItem.getExpectedValue())); // 转义一下再填充
 
         handleMap.put(MsAssertionCondition.REGEX.name(),
                 """