Update merge requests page button

MR: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/55218

app/views/projects/merge_requests/_nav_btns.html.haml

@@ -2,9 +2,9 @@
   = render 'shared/issuable/csv_export/button', issuable_type: 'merge-requests'
 
 - if @can_bulk_update
-  = button_tag "Edit merge requests", class: "gl-button btn gl-mr-3 js-bulk-update-toggle"
+  = button_tag "Edit merge requests", class: "gl-button btn btn-default gl-mr-3 js-bulk-update-toggle"
 - if merge_project
-  = link_to new_merge_request_path, class: "gl-button btn btn-success", title: "New merge request" do
+  = link_to new_merge_request_path, class: "gl-button btn btn-confirm", title: "New merge request" do
     New merge request
 
   = render 'shared/issuable/csv_export/modal', issuable_type: 'merge_requests'

changelogs/unreleased/update-mr-page-buttons.yml

+---
+title: Update button to btn-confirm on merge requests page
+merge_request: 55218
+author:
+type: changed