Fix link to billing

app/controllers/projects/clusters/gcp_controller.rb

@@ -42,7 +42,8 @@ class Projects::Clusters::GcpController < Projects::ApplicationController
     when 'true'
       return
     when 'false'
-      flash[:alert] = _('Please enable billing for one of your projects to be able to create a cluster.')
+      flash[:alert] = _('Please <a href=%{link_to_billing}>enable billing for one of your projects to be able to create a cluster</a>. Please try again.').html_safe %
+        { link_to_billing: "https://console.cloud.google.com/freetrial?utm_campaign=2018_cpanel&utm_source=gitlab&utm_medium=referral" }
     else
       flash[:alert] = _('We could not verify that one of your projects on GCP has billing enabled. Please try again.')
     end

app/workers/check_gcp_project_billing_worker.rb

@@ -4,7 +4,7 @@ class CheckGcpProjectBillingWorker
   include ApplicationWorker
   include ClusterQueue
 
-  LEASE_TIMEOUT = 15.seconds.to_i
+  LEASE_TIMEOUT = 3.seconds.to_i
   SESSION_KEY_TIMEOUT = 5.minutes
   BILLING_TIMEOUT = 1.hour