FEATURE: Hash user API keys in the database (#9344)

The 'key' column will be dropped in a future commit.

spec/integration/user_api_keys_spec.rb

@@ -3,12 +3,12 @@
 require 'rails_helper'
 
 describe 'user api keys integration' do
-  fab!(:user_api_key) { Fabricate(:readonly_user_api_key) }
-
   it 'updates last used time on use' do
     freeze_time
 
+    user_api_key = Fabricate(:readonly_user_api_key)
     user_api_key.update_columns(last_used_at: 7.days.ago)
+
     get '/session/current.json', headers: {
       HTTP_USER_API_KEY: user_api_key.key,
     }