FIX: use allowlist and blocklist terminology (#10209)

This is a PR of the renaming whitelist to allowlist and blacklist to the blocklist.

spec/requests/topics_controller_spec.rb

@@ -679,7 +679,7 @@ RSpec.describe TopicsController do
         expect(response.status).to eq(400)
       end
 
-      it 'raises an error with a status not in the whitelist' do
+      it 'raises an error with a status not in the allowlist' do
         put "/t/#{topic.id}/status.json", params: {
           status: 'title', enabled: 'true'
         }