Remove fetch-zuul-cloner from base-test job
This has been moved into legacy-base, as it represents zuulv2
functionality.  By moving it into legacy-base, we discourage native
zuulv3 jobs from using it, as it is not needed.
Once confirmed to be working, we'll promote the removal to base.
Depends-On:
- mirror-workspace-git-repos
- mirror-info
- configure-mirrors
- - role: fetch-zuul-cloner
- destination: "/usr/zuul-env/bin/zuul-cloner"
- repo_src_dir: "/home/zuul/src/git.openstack.org"
