Revert "Include read_global_vars.yml in pre-run: zuul.d/adoption.yaml"

[amartyasinha]

Reverts #3278

The reason to remove the playbook from pre-run stage from Zuul is, Zuul is not storing the cached vars that we added in pre-run. Maybe it is possible by some other way, but lets remove this for now.

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[softwarefactory-project-zuul]

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https://softwarefactory-project.io/zuul/t/rdoproject.org/buildset/38b3d945ed0a4cbd973d65d0fe399909

✔️ openstack-k8s-operators-content-provider SUCCESS in 3h 43m 02s
✔️ podified-multinode-edpm-deployment-crc SUCCESS in 1h 23m 35s
❌ cifmw-crc-podified-edpm-baremetal FAILURE in 41m 02s
❌ cifmw-pod-zuul-files FAILURE in 5m 35s
✔️ adoption-standalone-to-crc-ceph-provider SUCCESS in 3h 14m 55s
✔️ noop SUCCESS in 0s
✔️ cifmw-pod-ansible-test SUCCESS in 9m 11s
✔️ cifmw-pod-pre-commit SUCCESS in 8m 23s
✔️ build-push-container-cifmw-client SUCCESS in 24m 39s