Add ClusterClass support machine pools

[richardcase]

trafficstars

/kind feature /priority important-soon /triage accepted

Describe the solution you'd like Now the MachinePool support for ClusterClass has merged upstream in CAPI we can add it to CAPA.

Anything else you would like to add: [Miscellaneous information that will assist in solving the issue.]

Environment:

• Cluster-api-provider-aws version:
• Kubernetes version: (use kubectl version):
• OS (e.g. from /etc/os-release):

[richardcase]

/assign /lifecycle active

[richardcase]

Will do this at the same time as #3166

[k8s-triage-robot]

This issue is labeled with priority/important-soon but has not been updated in over 90 days, and should be re-triaged. Important-soon issues must be staffed and worked on either currently, or very soon, ideally in time for the next release.

You can:

• Confirm that this issue is still relevant with /triage accepted (org members only)
• Deprioritize it with /priority important-longterm or /priority backlog
• Close this issue with /close

For more details on the triage process, see https://www.kubernetes.dev/docs/guide/issue-triage/

/remove-triage accepted

[richardcase]

/triage accepted