Allow upgrades skipping minors for worker nodes

[fabriziopandini]

What would you like to be added (User Story)?

It would be great to have a better API/better automation for streamlined upgrades in managed topologies

Detailed Description

This KEP introduced the idea of streamlined upgrades, and, by playing around with K8s version skew policies, making it possible to upgrade by 2 or 3 Kubernetes minor versions by minimizing the worker's machines rollouts.

While streamlined upgrades with managed topologies are possible, the UX is not ideal, because it requires manually upgrading through all the minors and applying "topology.cluster.x-k8s.io/hold-upgrade-sequence" to the first MD till the target version is reached, but it should work.

We should improve managed topologies API/automation so we can allow users to trigger streamlined upgrades with a single CR change

Anything else you would like to add?

Disussion in #8614 could be relevant for defining the API for this issue

Label(s) to be applied

/kind feature
One or more /area label. See https://github.com/kubernetes-sigs/cluster-api/labels?q=area for the list of labels.

[fabriziopandini]

/triage accepted
/help

[k8s-ci-robot]

@fabriziopandini:
This request has been marked as needing help from a contributor.

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In response to this:

/triage accepted
/help

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[fabriziopandini]

/area topology

[killianmuldoon]

/area clusterclass

[fabriziopandini]

/priority backlog