Make file upload button on MR edit page tab accessible

Button previously was not tab accessible

app/views/shared/notes/_hints.html.haml

@@ -27,7 +27,7 @@
       or
       %button.attach-new-file.markdown-selector{ type: 'button' }= _("attach a new file")
 
-    %button.btn.markdown-selector.button-attach-file.btn-link{ type: 'button', tabindex: '-1' }
+    %button.btn.markdown-selector.button-attach-file.btn-link{ type: 'button' }
       = sprite_icon('media')
       %span.text-attach-file<>
         = _("Attach a file")

changelogs/unreleased/cngo-make-mr-edit-file-upload-button-tab-accessible.yml

+---
+title: Make file upload button on MR edit page tab accessible
+merge_request: 40995
+author:
+type: fixed