v1beta2 contract: move AWSMachine failureDomain from spec to status

[damdo]

Parent: #5448

In the new v1beta3 AWSMachine type, the v1beta2 contract reads status.failureDomain (observation) instead of spec.failureDomain (input).

• Add FailureDomain *string to AWSMachineStatus
• Keep spec.failureDomain for backward compat (deprecated)
• Copy spec value to status during reconciliation
• CAPI contract accessor: infrastructure_machine.go:103 reads status.failureDomain; infrastructure_machine.go:96 reads spec.failureDomain as deprecated

[kubernetes-prow]

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