Finish moving python-jenkins jobs in-tree
Finish moving python-jenkins jobs in-tree

The repo has moved now all jobs in-tree, remove the templates and jobs
here.

Depends-On: https://review.opendev.org/660021
Change-Id: I692903905cdb5bd22617b9070f4cda59a7afbe04

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