🌱 Refactor Cluster controller

[fabriziopandini]

What this PR does / why we need it:
This PR refactors the cluster controller introducing the same changes recently introduced in machine controller, machineset controller, md controller.
This will allow to add v1beta2 conditions in a follow-up PR

/area cluster

Which issue(s) this PR fixes:
Rif #11105

[k8s-ci-robot]

@fabriziopandini: The label(s) area/cluster cannot be applied, because the repository doesn't have them.

In response to this:

What this PR does / why we need it:
This PR refactors the cluster controller introducing the same changes recently introduced in machine controller, machineset controller, md controller.
This will allow to add v1beta2 conditions in a follow-up PR

/area cluster

Which issue(s) this PR fixes:
Rif #11105

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.

[sbueringer]

/test pull-cluster-api-e2e-main

[fabriziopandini]

/test pull-cluster-api-e2e-blocking-main

[sbueringer]

Thank you! Very nice!!

/lgtm
/approve

/hold
If you want to squash

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: d7f59eae320856594154f45bb798a26b4b18ef01

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: sbueringer

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[fabriziopandini]

/hold cancel

[k8s-ci-robot]

@fabriziopandini: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-cluster-api-e2e-main	66cf3d6	link	true	/test pull-cluster-api-e2e-main

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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[fabriziopandini]

/retest

[fabriziopandini]

/hold
Found some minor stuff to fix

[fabriziopandini]

/hold cancel
The issue wasn't in the code included in this PR, but on some small changes I'm applying on top in a follow up PR implementing v1beta2 conditions