🐛 Add externalManagedControlPlane Status to fix node drain under EKS

[dthorsen]

What this PR does / why we need it: When using the AWSManagedControlPlane, if you delete a Machine resource it does not gracefully cordon and drain the associated Node. The fix for this in CAPI is to have the managed control plane provider set the externalManagedControlPlane: true value in its status to signal to cluster-api that the control plane Nodes are not visible in the cluster.

Related to: kubernetes-sigs/cluster-api#3631

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[vincepri]

/ok-to-test
/approve
/assign @randomvariable

/cc @alexeldeib @CecileRobertMichon
(for CAPZ)

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: vincepri

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[randomvariable]

/lgtm