[tempest] Remove deprecated tempest role

[kstrenkova]

The tempest role is deprecated as test_operator role now includes Tempest test execution. The default test role was changed to test_operator in every scenario, making this role unused.

[openshift-ci]

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[centosinfra-prod-github-app]

Build failed (check pipeline). Post recheck (without leading slash)
to rerun all jobs. Make sure the failure cause has been resolved before
you rerun jobs.

https://gateway-cloud-softwarefactory.apps.ocp.cloud.ci.centos.org/zuul/t/rdoproject.org/buildset/9276ce2fa12443c28bdf362b070ba8bf

✔️ openstack-k8s-operators-content-provider SUCCESS in 1h 52m 47s
✔️ podified-multinode-edpm-deployment-crc SUCCESS in 1h 31m 11s
❌ cifmw-crc-podified-edpm-baremetal RETRY_LIMIT in 32m 14s
❌ cifmw-crc-podified-edpm-baremetal-minor-update NODE_FAILURE Node(set) request 099-0000134310 failed in 0s
✔️ cifmw-pod-zuul-files SUCCESS in 5m 09s
✔️ noop SUCCESS in 0s
✔️ cifmw-pod-ansible-test SUCCESS in 9m 08s
✔️ cifmw-pod-pre-commit SUCCESS in 8m 19s

[kstrenkova]

recheck