v1beta2 contract: promote v1beta2 conditions, deprecate old status fields

[damdo]

Parent: #5448

In the new v1beta3 types:

• Top-level Conditions []metav1.Condition (no V1Beta2 wrapper)
• Old fields moved into Deprecated struct:

type AWSClusterDeprecatedStatus struct {
    V1Beta1 *AWSClusterV1Beta1DeprecatedStatus `json:"v1beta1,omitempty"`
}
type AWSClusterV1Beta1DeprecatedStatus struct {
    Ready      bool                      `json:"ready,omitempty"`
    Conditions clusterv1beta1.Conditions `json:"conditions,omitempty"`
}

For AWSMachine, also include FailureReason and FailureMessage in the deprecated struct.

Add GetV1Beta1Conditions()/SetV1Beta1Conditions() accessor methods.

Reference: CAPV's api/govmomi/v1beta2/vspherecluster_types.go:206-295

[kubernetes-prow]

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