[unmaintained only] Drop sdk job

Since [1] some projects like octavia transitioned
to eol and their unmaintained branches got removed.
with it sdk job started failing, removing this job
from our periodic queue.

[1] https://review.opendev.org/q/topic:%22eom-to-eol%22

Change-Id: I9333358bd20e9314ea39db021ebb7641dc33aa45

zuul.d/job-templates.yaml

@@ -75,7 +75,6 @@
         - devstack-tobiko-neutron:
             voting: true
         - ironic-tempest-ipa-wholedisk-bios-agent_ipmitool-tinyipa
-        - openstacksdk-functional-devstack-networking
         - neutron-linuxbridge-tempest-plugin-nftables
         - neutron-ovs-tempest-plugin-iptables_hybrid-nftables
         - devstack-enforce-scope
@@ -141,7 +140,6 @@
         - devstack-tobiko-neutron:
             voting: true
         - ironic-tempest-ipa-wholedisk-bios-agent_ipmitool-tinyipa
-        - openstacksdk-functional-devstack-networking
         - neutron-linuxbridge-tempest-plugin-scenario-nftables
         - neutron-ovs-tempest-plugin-scenario-iptables_hybrid-nftables
         - devstack-enforce-scope