DNM: trace extra_variable_files merge for premetal

[michburk]

a set of debug changes to check an extra variable files change

Generated-By: Claude Sonnet 5 noreply@anthropic.com

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https://gateway-cloud-softwarefactory.apps.ocp.cloud.ci.centos.org/zuul/t/rdoproject.org/buildset/b82c915e7d0c452b85692cb9a997e85f

✔️ openstack-k8s-operators-content-provider SUCCESS in 1h 57m 48s
✔️ podified-multinode-edpm-deployment-crc SUCCESS in 1h 35m 46s
✔️ cifmw-crc-podified-edpm-baremetal SUCCESS in 1h 43m 57s
✔️ cifmw-pod-zuul-files SUCCESS in 5m 38s
✔️ noop SUCCESS in 0s
❌ cifmw-pod-ansible-test FAILURE in 6m 50s
❌ cifmw-pod-pre-commit FAILURE in 8m 53s
✔️ cifmw-molecule-reproducer SUCCESS in 15m 28s