Add the sort argument in MR analytics

ee/app/assets/javascripts/analytics/merge_request_analytics/graphql/queries/throughput_table.query.graphql

 query($fullPath: ID!, $startDate: Time!, $endDate: Time!, $limit: Int!) {
   project(fullPath: $fullPath) {
-    mergeRequests(first: $limit, mergedAfter: $startDate, mergedBefore: $endDate) {
+    mergeRequests(
+      first: $limit
+      mergedAfter: $startDate
+      mergedBefore: $endDate
+      sort: MERGED_AT_DESC
+    ) {
       nodes {
         iid
         title

ee/changelogs/unreleased/sort-mr-analytics-by-merged-at-desc.yml

+---
+title: Sort merge requests by merged at date in Merge Request Analytics
+merge_request: 41272
+author:
+type: changed