Rabbitmq vhost and user support

[lmiccini]

Add support for a dedicated rabbitmq cluster for notifications.

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-22695

[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/178551e24f714904ade13446c82e533b

❌ openstack-k8s-operators-content-provider FAILURE in 6m 55s
⚠️ heat-operator-tempest-multinode SKIPPED Skipped due to failed job openstack-k8s-operators-content-provider

[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/ac9a3a4174934792a479059b7bfea3d5

✔️ openstack-k8s-operators-content-provider SUCCESS in 51m 11s
❌ heat-operator-tempest-multinode FAILURE in 30m 21s

[lmiccini]

/test heat-operator-build-deploy-kuttl

[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	e71908f	link	true	/test precommit-check

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