o/origin: make microshift jobs conditionally triggered

Motivated by openshift/origin#30453 where I modified OWNERS and had to pass microshift jobs. This setting is consistent with other e2e jobs.

Author: petr-muller

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

@@ -804,6 +804,7 @@ tests:
     workflow: upi-vsphere-platform-external-ccm
   timeout: 6h0m0s
 - as: e2e-aws-ovn-microshift
+  skip_if_only_changed: ^(?:docs|\.github)/|\.md$|^(?:\.gitignore|OWNERS|OWNERS_ALIASES|PROJECT|LICENSE)$
   steps:
     cluster_profile: aws
     env:
@@ -813,6 +814,7 @@ tests:
     workflow: openshift-microshift-e2e-origin-conformance
   timeout: 6h0m0s
 - as: e2e-aws-ovn-microshift-serial
+  skip_if_only_changed: ^(?:docs|\.github)/|\.md$|^(?:\.gitignore|OWNERS|OWNERS_ALIASES|PROJECT|LICENSE)$
   steps:
     cluster_profile: aws-2
     env: