Add RabbitMQ version upgrade and queue type migration basic support

[lmiccini]

Implements RabbitMQ version upgrade for major/minor version changes
(e.g., 3.9 → 4.2) and queue type migrations (Mirrored → Quorum) using
a storage wipe approach with init containers.

## Version Tracking

- Status.CurrentVersion tracks the deployed RabbitMQ version
- target-version annotation (set by openstack-operator) triggers upgrades
- Detects existing 3.9 deployments on operator upgrade by checking for
  RabbitMQCluster resource existence during CurrentVersion initialization

## Multi-Phase State Machine

UpgradePhase status field tracks upgrade progress and enables resumption
after interruptions:
- "" → "DeletingResources" → "WaitingForPods" → "WaitingForCluster" → ""

Phases:
- DeletingResources: Delete RabbitMQCluster and ha-all policy (once)
- WaitingForPods: Wait for pod termination without re-deleting resources
- WaitingForCluster: Add wipe-data init container annotation
- "": Upgrade complete, clear phase when cluster ready

## Storage Wipe Implementation

Data-wipe init container runs before RabbitMQ container:
- Wipes /var/lib/rabbitmq (Mnesia data format changes between versions)
- Version-specific marker files (.operator-wipe-{version}) prevent re-wipe
- Reuses existing PVCs/PVs (no resource deletion required)
- Triggered by temporary storage-wipe-needed annotation on RabbitMQCluster

## Upgrade Workflow

1. openstack-operator sets target-version annotation
2. requiresStorageWipe() checks version compatibility (major/minor changes)
3. Status.UpgradePhase → "DeletingResources": Delete cluster and policy
4. Status.UpgradePhase → "WaitingForPods": Wait for pods to terminate
5. Status.UpgradePhase → "WaitingForCluster": Add storage-wipe-needed annotation
6. CreateOrPatch creates cluster with wipe-data init container
7. Init container wipes data based on marker file check
8. Cluster becomes ready: Update Status.CurrentVersion, clear UpgradePhase
9. Next reconcile: Remove storage-wipe-needed annotation via CreateOrPatch sync

## Configuration Version Selection

Uses target-version (not current version) for cluster configuration during
upgrades to prevent mid-upgrade configuration changes (e.g., TLS versions).

## RabbitMQ 4.x Changes

- TLS 1.3 enabled (RabbitMQ 4.x+)
- default_queue_type=quorum configuration
- deprecated_features.permit.classic_queue_mirroring=false
- quorum_queue.property_equivalence.relaxed_checks_on_redeclaration=true
- Automatic Mirrored → Quorum migration on 3.x → 4.x upgrades

## Webhook Validation

- Automatically overrides Mirrored to Quorum on RabbitMQ 4.x updates
- Blocks Mirrored → Quorum migration on RabbitMQ 3.x (no server enforcement)
- Allows migration when concurrent version upgrade to 4.x is present
- DefaultForUpdate() sets queueType=Quorum for RabbitMQ 4.x+ target versions

## Annotation Management

CreateOrPatch() in rabbitmqcluster.go now syncs annotations bidirectionally:
- Adds annotations from desired spec
- Removes annotations not in desired spec
Enables automatic cleanup of temporary storage-wipe-needed annotation.

## Init Container Preservation

Checks existing RabbitMQCluster for wipe-data init container and preserves
it across reconciles to avoid pod restarts. Combined with marker file check
in wipe script prevents duplicate data wipes.

## Queue Type Migration

Spec.QueueType change from Mirrored to Quorum triggers storage wipe workflow
(same phases as version upgrades). Required because mirrored queues cannot
be converted to quorum queues in-place.

Jira: https://issues.redhat.com/browse/OSPRH-22219

Depends-On: openstack-k8s-operators/openstack-operator#1805

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