Add padding to bottom of design notes sidebar

ee/app/assets/stylesheets/components/design_management/design.scss

@@ -26,7 +26,7 @@
 
 .image-notes {
   overflow-y: scroll;
-  padding: 0 $gl-padding;
+  padding: $gl-padding;
   padding-top: 50px;
   background-color: $white;
   flex-shrink: 0;

ee/changelogs/unreleased/design-comments-margin-bottom-fix.yml

+---
+title: Fix lack-of padding on design view notes sidebar
+merge_request: 29654
+author:
+type: fixed