fix(性能测试): 修复监控数据查询步长过长问题 (#5696)

Co-authored-by: BugKing <wangzhen@fit2cloud.com>

backend/src/main/java/io/metersphere/performance/service/MetricQueryService.java

@@ -266,7 +266,7 @@ public class MetricQueryService {
                     .findFirst();
             if (dataOptional.isPresent()) {
                 GranularityData.Data data = dataOptional.get();
-                granularity = data.getGranularity();
+                granularity = data.getGranularity() / 1000;
             }
         } catch (Exception e) {
             LogUtil.error(e.getMessage(), e);