Remove changelog entry; Changes after review

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

@@ -46,7 +46,7 @@
         -# This tab is always loaded via AJAX
       - if @pipelines.any?
         #pipelines.pipelines.tab-pane
-          = render 'projects/merge_requests/show/pipelines', endpoint: request.fullpath
+          = render 'projects/merge_requests/show/pipelines', endpoint: url_for(params.merge(format: :json))
 
   .mr-loading-status
     = spinner

changelogs/unreleased/fix-gb-invalid-new-merge-request-api.yml

----
-title: Fix rendering new merge request pipelines
-merge_request: 9032
-author: