🏃Minor fix for MachinePool kubebuilder rbac tag

[sedefsavas]

What this PR does / why we need it:
This PR removes exp.infrastructure.cluster.x-k8s.io from machine pool rbac. Should be exp.cluster.x-k8s.io instead.

[k8s-ci-robot]

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[sedefsavas]

/assign @vincepri

[vincepri]

/hold

I think it should be both, because MachinePool implementations might refer to experiments in infrastructure provider, like CAPZ

@CecileRobertMichon can you confirm?

[CecileRobertMichon]

I think it should be both, because MachinePool implementations might refer to experiments in infrastructure provider, like CAPZ

Correct, see #2959. cc @devigned

[sedefsavas]

Makes sense, didn't think about providers. Thanks!