🌱 Feature gate for old infra machine naming

[lentzi90]

What this PR does / why we need it:

There is a breaking change to the way infra machines are named in v1.7.0. This commit adds a feature gate for getting the old behavior back. It defaults to disabled so the new behavior stays. It is also marked as deprecated so it can be removed in a future minor release.

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #10463 (temporary fix to give more time to adapt)

/area provider/control-plane-kubeadm
/area machineset

[k8s-ci-robot]

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[lentzi90]

/hold
To reach consensus about the general direction on the issue first

[mdbooth]

Slack discussion: https://kubernetes.slack.com/archives/C8TSNPY4T/p1715075887741569

[k8s-ci-robot]

PR needs rebase.

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[lentzi90]

See #10587