v1beta2 contract: convert FailureDomains from map to list

[damdo]

Parent: #5448

In the new v1beta3 types, FailureDomains uses a list ([]clusterv1.FailureDomain with listType=map, listMapKey=name) instead of a map (clusterv1beta1.FailureDomains = map[string]FailureDomainSpec).

Affects v1beta3 versions of: AWSCluster, AWSManagedCluster, AWSManagedControlPlane, ROSACluster.

The v1beta2 spoke types keep the map representation. Conversion webhooks handle map↔list translation. CAPI's internal/contract/infrastructure_cluster.go:141 also handles this based on contract version.

[kubernetes-prow]

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