Migrate to shared alert HAML partial in _commits.html.haml

app/views/projects/commits/_commits.html.haml

@@ -34,10 +34,11 @@
         = render partial: 'projects/commits/commit', collection: context_commits, locals: { project: project, ref: ref, merge_request: merge_request }
 
 - if hidden > 0
-  %li.gl-alert.gl-alert-warning
-    .gl-alert-container
-      = sprite_icon('warning', size: 16, css_class: 'gl-icon gl-alert-icon gl-alert-icon-no-title')
-      .gl-alert-content
+  %li
+    = render 'shared/global_alert',
+      variant: :warning,
+      dismissible: false do
+      .gl-alert-body
         = n_('%s additional commit has been omitted to prevent performance issues.', '%s additional commits have been omitted to prevent performance issues.', hidden) % number_with_delimiter(hidden)
 
 - if can_update_merge_request && context_commits&.empty?