Project Settings Repo Headers Expand/Collapse 1/8

Project Settings General Headers (h4 elements) expand/collapse on
mouse-click / tap, like using the Expand/Collapse button. Other h4
headers in other Project Settings pages do not expande/collapse on
mouse-click / tap, but only using the Expand/Collapse button. This may
seem inconsistent to the user.

The h4 headers of Project Settings General get the expand/collapse
behavior through classes settings-title, js-settings-toggle and
js-settings-toggle-trigger-only.

This MR adds classes settings-title, js-settings-toggle and
js-settings-toggle-trigger-only to the h4 headers in Project Settings
Repository Default branch. This enables the expand/collapse behavior on
mouse-click / tap for the h4 headers.

app/views/projects/default_branch/_show.html.haml

@@ -2,7 +2,7 @@
 
 %section.settings.no-animate#default-branch-settings{ class: ('expanded' if expanded) }
   .settings-header
-    %h4= _('Default branch')
+    %h4.settings-title.js-settings-toggle.js-settings-toggle-trigger-only= _('Default branch')
     %button.btn.js-settings-toggle
       = expanded ? _('Collapse') : _('Expand')
     %p

changelogs/unreleased/205484-04-project-settings-headers-repo-default-branch.yml

+---
+title: Project Settings Repository Default branch header expand/collaps on click
+merge_request: 55228
+author: Daniel Schömer
+type: changed