helm: enable Cluster API machinepool support

[jackfrancis]

What type of PR is this?

/kind feature

What this PR does / why we need it:

This PR updates the official helm chart to include support for Cluster API machinepools, which requires the following:

1. Role and ClusterRole definitions need to be updated to include machinepools and machinepools/scale
2. cluster-autoscaler image version needs to be v1.27.1 so that the runtime itself delivers support for machinepools

• see [clusterapi] Add support for MachinePools #4676

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?

NONE

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

[jackfrancis]

/assign @mboersma @elmiko

Documentation looks up-to-date from #4676, so I think we just need to update the helm chart to include the rquired foo and CA version, and then rev the helm chart version.

[mboersma]

/lgtm

Thanks @jackfrancis!

[elmiko]

looks good to me as well

cc @gjtempleton

[jackfrancis]

@gjtempleton are you able to review/merge this PR?

I've got another CAPI provider helm PR here, once we get this one in I'll update #5762 to rev the helm chart version to 9.30.0 on top of this one.

Thanks!

[gjtempleton]

Thanks!

/lgtm
/approve

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