ci: drop the compliance tag from DCO check

Historically the DCO check was routed to a dedicated but slow machine
that guaranteed that no CI would be stuck waiting on the miniscule
compliance job.

With the Eclipse migration and CI/CD being slightly out of our control,
it's just more convenient to drop this tag rather than request
configuration change in the instance.

Signed-off-by: Zygmunt Krynicki <zygmunt.krynicki@huawei.com>

.oniro-ci/dco.yaml

@@ -47,7 +47,6 @@
 .dco:
   stage: compliance
   interruptible: true
-  tags: [compliance]
   # This pipeline relies on a container with the dco-check package pre-installed.
   # Precise, machine readable description of this container can be found in
   # https://booting.oniroproject.org/distro/oniro/-/blob/master/.oniro-ci/containers/dco-check/Dockerfile