Remove castellan legacy jobs
Remove castellan legacy jobs

This is now in-tree in castellan,
so remove from here.

Depends-On: https://review.openstack.org/#/c/550984/
Needed-By: https://review.openstack.org/#/c/551011/
Change-Id: If010728754097e7dd874aeaf3488379c0379e018

openstack-infra/project-config,openstack-infra/project-config