origin: remove skip_if_only_changed from publicnet jobs (#66864)

It conflicts and overrides always_run: false.

Author: stbenjam

ci-operator/config/openshift/origin/openshift-origin-main.yaml

@@ -307,7 +307,6 @@ tests:
   as: e2e-aws-ovn-serial-publicnet
   optional: true
   shard_count: 2
-  skip_if_only_changed: ^(?:docs|\.github)/|\.md$|^(?:\.gitignore|OWNERS|OWNERS_ALIASES|PROJECT|LICENSE)$
   steps:
     cluster_profile: aws-2
     env: