[yoga only] Drop devstack-tobiko-neutron job

Since yoga transition to unmaintained tobiko job broken
with the Related bug. Even after fixing the job to run
on focal with [1] job fails with tobiko requirment bumps[2].

With current state of yoga branch, this patch just drops the
broken job from yoga periodic queue.

[1] https://review.opendev.org/c/x/devstack-plugin-tobiko/+/911696
[2] https://review.opendev.org/c/x/tobiko/+/910589

Related-Bug: #2056276
Change-Id: I19b9c6a701c78b78b3ef7c673b198b029a158c82

Author: karelyatin

zuul.d/job-templates.yaml

@@ -101,8 +101,6 @@
         - neutron-ovn-tempest-mariadb-full
         - neutron-ovn-tempest-ovs-release
         - neutron-ovn-tempest-ovs-release-ipv6-only
-        - devstack-tobiko-neutron:
-            voting: true
         - ironic-tempest-ipa-wholedisk-bios-agent_ipmitool-tinyipa
         - openstacksdk-functional-devstack-networking
         - neutron-linuxbridge-tempest-plugin-scenario-nftables