Fix overflow in breadcrumbs list mainly on mobile

Signed-off-by: Takuya Noguchi <takninnovationresearch@gmail.com>

app/views/layouts/nav/_breadcrumbs.html.haml

@@ -9,7 +9,7 @@
       = button_tag class: 'toggle-mobile-nav', type: 'button' do
         %span.sr-only= _("Open sidebar")
         = sprite_icon('hamburger', size: 18)
-    .breadcrumbs-links{ data: { testid: 'breadcrumb-links', qa_selector: 'breadcrumb_links_content' } }
+    .breadcrumbs-links.overflow-auto{ data: { testid: 'breadcrumb-links', qa_selector: 'breadcrumb_links_content' } }
       %ul.list-unstyled.breadcrumbs-list.js-breadcrumbs-list
         - unless hide_top_links
           = header_title

changelogs/unreleased/25301-breadcrumbs-list-overflow-on-compare-with-sha1-on-mobile.yml

+---
+title: Fix overflow in breadcrumbs list mainly on mobile
+merge_request: 59552
+author: Takuya Noguchi
+type: other