Merge branch '47245-hr-avatar' into 'master'

Resolve "avatar settings page hr is misbehaving"

Closes #47245

See merge request gitlab-org/gitlab-ce!19667

app/assets/stylesheets/bootstrap_migration.scss

@@ -89,6 +89,10 @@ a {
   color: $gl-link-color;
 }
 
+hr {
+  overflow: hidden;
+}
+
 .form-group.row .col-form-label {
   // Bootstrap 4 aligns labels to the left
   // for horizontal forms