Move module EE::Gitlab::Throttle to it's own file

ee/lib/ee/gitlab/rack/attack.rb

 # frozen_string_literal: true
 
-module EE::Gitlab::Throttle
-  def self.settings
-    Gitlab::Throttle.settings
-  end
-
-  def self.incident_management_options
-    limit_proc = proc { |req| settings.throttle_incident_management_notification_per_period }
-    period_proc = proc { |req| settings.throttle_incident_management_notification_period_in_seconds.seconds }
-
-    { limit: limit_proc, period: period_proc }
-  end
-end
-
 module EE::Gitlab::Rack::Attack
   Rack::Attack.throttle('throttle_incident_management_notification_web', EE::Gitlab::Throttle.incident_management_options) do |req|
     EE::Gitlab::Throttle.settings.throttle_incident_management_notification_enabled &&

ee/lib/ee/gitlab/throttle.rb

+# frozen_string_literal: true
+
+module EE::Gitlab::Throttle
+  def self.settings
+    Gitlab::Throttle.settings
+  end
+
+  def self.incident_management_options
+    limit_proc = proc { |req| settings.throttle_incident_management_notification_per_period }
+    period_proc = proc { |req| settings.throttle_incident_management_notification_period_in_seconds.seconds }
+
+    { limit: limit_proc, period: period_proc }
+  end
+end