Rabbitmq vhost and user support

[lmiccini]

Add new messagingBus and notificationsBus interfaces to hold cluster,
user and vhost names for optional usage.
The controller adds these values to the TransportURL create request when present.

Additionally, we migrate RabbitMQ cluster name to RabbitMq config struct
using DefaultRabbitMqConfig from infra-operator to automatically
populate the new Cluster field from legacy RabbitMqClusterName.

Example usage:

  spec:
    messagingBus:
      cluster: rpc-rabbitmq
      user: rpc-user
      vhost: rpc-vhost
    notificationsBus:
      cluster: notifications-rabbitmq
      user: notifications-user
      vhost: notifications-vhost

Jira: https://issues.redhat.com/browse/OSPRH-22694

[openshift-ci]

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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
you rerun jobs.

https://softwarefactory-project.io/zuul/t/rdoproject.org/buildset/b152cd419e3f463b8de56ac95bcb4bff

✔️ openstack-k8s-operators-content-provider SUCCESS in 1h 03m 30s
❌ cinder-operator-kuttl FAILURE in 31m 31s
❌ cinder-operator-tempest FAILURE in 38m 09s

[lmiccini]

recheck

[openshift-ci]

@lmiccini: The following test 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/precommit-check	d7ca483	link	true	/test precommit-check

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[openshift-merge-robot]

PR needs rebase.

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