add CHANGELOG/v1.22.0-mce-217.md

CHANGELOG/v1.22.0-mce-217.md

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+## Changes by Kind
+
+### Feature
+
+- **ARO-HCP Support**: Add comprehensive ARO (Azure Red Hat OpenShift) Hosted Control Plane support using Azure Service Operator
+  - New CRDs: AROCluster, AROControlPlane, and AROMachinePool for managing ARO-HCP clusters
+  - ASO-based resource management for HcpOpenShiftClusters, HcpOpenShiftClustersNodePools, and HcpOpenShiftClustersExternalAuth
+  - Support for external authentication providers with validation (15 character name limit)
+  - Automated provisioning of Azure infrastructure (VNets, NSGs, Key Vaults, Role Assignments)
+  - MachinePool management with providerIDList population for node tracking
+  - Proper lifecycle management including creation, updates, and deletion
+
+### Infrastructure Components
+
+- Network Security Groups (networksecuritygroups.network.azure.com)
+- Key Vaults (vaults.keyvault.azure.com)
+- User-assigned identities and role assignments
+- Virtual networks and subnets
+
+### Dependencies
+
+- Updated ASO CRDs to support ARO-HCP resources
+- Migrated cluster-api imports from v1beta1 to v1beta2 for ARO components
+
+## Details
+
+This release is based on upstream v1.22.0 with Red Hat MCE-specific additions for ARO-HCP support.
+
+Base upstream version: v1.22.0
+MCE version: 2.17