Unmaintained only: Remove grenade jobs from check and gate queue

Related-Bug: #2056276
Change-Id: Ie30e6da83ee89705401a9811a48992dee5b8fa03

Author: elajkat

zuul.d/project.yaml

@@ -20,8 +20,6 @@
         - neutron-functional-with-uwsgi
         - neutron-fullstack-with-uwsgi
         - neutron-ovs-rally-task
-        - neutron-ovs-grenade-multinode
-        - neutron-ovs-grenade-dvr-multinode
         - neutron-ovs-tempest-multinode-full
         - neutron-ovs-tempest-dvr-ha-multinode-full
         - neutron-ovn-tempest-ipv6-only
@@ -32,6 +30,4 @@
         - neutron-functional-with-uwsgi
         - neutron-fullstack-with-uwsgi
         - neutron-ovs-tempest-multinode-full
-        - neutron-ovs-grenade-multinode
-        - neutron-ovs-grenade-dvr-multinode
         - neutron-ovn-tempest-ipv6-only