Allow throttling code in test environment

This code should not break other tests because the rate limits are off by default.

config/initializers/rack_attack_global.rb

@@ -21,7 +21,6 @@ class Rack::Attack
     { limit: limit_proc, period: period_proc }
   end
 
-  def self.define_throttles
   throttle('throttle_unauthenticated', throttle_unauthenticated_options) do |req|
     settings.throttle_unauthenticated_enabled &&
       req.unauthenticated? &&
@@ -39,9 +38,6 @@ class Rack::Attack
       req.web_request? &&
       req.authenticated_user_id
   end
-  end
-
-  define_throttles unless Rails.env.test?
 
   class Request
     def unauthenticated?

spec/requests/rack_attack_spec.rb

@@ -4,9 +4,6 @@ describe Rack::Attack do
   let(:settings) { Gitlab::CurrentSettings.current_application_settings }
 
   before do
-    # Ensure throttles are defined, because this is normally skipped for tests
-    described_class.define_throttles
-
     # Instead of test environment's :null_store
     Rack::Attack.cache.store = ActiveSupport::Cache::MemoryStore.new