CI: remove package:agent task

This has been replaced by bash in greenhouse-ci

Author: aramprice

Rakefile

@@ -6,7 +6,6 @@ import 'lib/tasks/build/gcp.rake'
 import 'lib/tasks/build/vsphere.rake'
 import 'lib/tasks/label/aws.rake'
 import 'lib/tasks/label/gcp.rake'
-import 'lib/tasks/package/agent.rake'
 import 'lib/tasks/package/psmodules.rake'
 import 'lib/tasks/package/vsphere_ova.rake'
 import 'lib/tasks/publish/azure.rake'