Convert admin/settings controller specs to system specs (#31548)

spec/support/system_helpers.rb

@@ -0,0 +1,19 @@
+# frozen_string_literal: true
+
+module SystemHelpers
+  def admin_user
+    Fabricate(:user, role: UserRole.find_by(name: 'Admin'))
+  end
+
+  def submit_button
+    I18n.t('generic.save_changes')
+  end
+
+  def success_message
+    I18n.t('generic.changes_saved_msg')
+  end
+
+  def form_label(key)
+    I18n.t key, scope: 'simple_form.labels'
+  end
+end