Project Settings Repo Headers Expand/Collapse 7/8

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 Deploy keys. This enables the expand/collapse behavior on
mouse-click / tap for the h4 headers.

app/views/shared/deploy_keys/_index.html.haml

 - expanded = expanded_by_default?
 %section.qa-deploy-keys-settings.settings.no-animate#js-deploy-keys-settings{ class: ('expanded' if expanded), data: { qa_selector: 'deploy_keys_settings_content' } }
   .settings-header
-    %h4= _('Deploy keys')
+    %h4.settings-title.js-settings-toggle.js-settings-toggle-trigger-only= _('Deploy keys')
     %button.btn.gl-button.btn-default.js-settings-toggle{ type: 'button' }
       = expanded ? 'Collapse' : 'Expand'
     %p

changelogs/unreleased/205484-10-project-settings-headers-repository-deploy-keys.yml

+---
+title: Project Settings Repository Deploy keys header expands/collapses on click / tap
+merge_request: 55234
+author: Daniel Schömer
+type: changed