Added changelog entry

ee/changelogs/unreleased/225660-vsa-median-data-is-being-requested-unnecessarily-for-hidden-sta.yml

+---
+title: VSA fetch duration data for active stages only
+merge_request: 37336
+author:
+type: fixed

ee/spec/frontend/analytics/cycle_analytics/store/modules/duration_chart/actions_spec.js

@@ -26,7 +26,7 @@ const activeStages = [stage1, stage2];
 const rootState = {
   startDate,
   endDate,
-  stages: [stage1, stage2, hiddenStage],
+  stages: [...activeStages, hiddenStage],
   selectedGroup,
   featureFlags: {
     hasDurationChart: true,