Add RHOSO cluster_id to be set in the ansible variables

[slawqo]

To integrate data insights data from the control plane (OCP) collected by the insights-operator and data from the EDPM nodes, which is collected by the insights-client we need to have some kind of RHOSO cluster_id stored in the EDPM nodes somewhere.
This patch proposes to generate such RHOSO cluster_id as <ocp_cluster_id>: as such pair should clearly identify single RHOSO cluster because there can not be more that one OpenStack cluster deployed in single OCP namespace.
This ID is then set as ansible variable in the ansible group vars in the generated inventory for each OpenStackDataPlaneNodeSet created and edpm ansible role will then be able to write it on the edpm nodes.

Related: #OSPRH-19918

[openshift-ci]

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[openshift-ci]

@slawqo: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/functional	9cb4291	link	true	/test functional
ci/prow/precommit-check	9cb4291	link	true	/test precommit-check
ci/prow/openstack-operator-build-deploy-kuttl-4-18	9cb4291	link	true	/test openstack-operator-build-deploy-kuttl-4-18
ci/prow/openstack-operator-build-deploy-kuttl	9cb4291	link	true	/test openstack-operator-build-deploy-kuttl

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[softwarefactory-project-zuul]

Build failed (check pipeline). Post recheck (without leading slash)
to rerun all jobs. Make sure the failure cause has been resolved before
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https://softwarefactory-project.io/zuul/t/rdoproject.org/buildset/14b5d2e7525f468eb96b6f00a46e4749

✔️ openstack-k8s-operators-content-provider SUCCESS in 2h 57m 52s
❌ podified-multinode-edpm-deployment-crc FAILURE in 36m 19s
❌ cifmw-crc-podified-edpm-baremetal FAILURE in 1h 29m 30s
❌ adoption-standalone-to-crc-ceph-provider FAILURE in 2h 34m 07s
❌ openstack-operator-tempest-multinode FAILURE in 1h 40m 10s

[openshift-merge-robot]

PR needs rebase.

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