✨ KCP: Implement support for machine taints

[chrischdi]

What this PR does / why we need it:

Part of: #12908

Implements the KCP related parts for machine taints

• Implement ControlPlane contract changes

• Implement KCP changes to fulfill the contract

• Implement test coverage (extend the e2e used for MachineDeployments)

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #

/area provider/control-plane-kubeadm

[k8s-ci-robot]

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[chrischdi]

/test help

[k8s-ci-robot]

@chrischdi: The specified target(s) for /test were not found.
The following commands are available to trigger required jobs:

/test pull-cluster-api-build-main

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

/test pull-cluster-api-e2e-conformance-ci-latest-main

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

/test pull-cluster-api-e2e-latestk8s-main

/test pull-cluster-api-e2e-main

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

/test pull-cluster-api-e2e-mink8s-main

/test pull-cluster-api-e2e-upgrade-1-35-1-36-main

/test pull-cluster-api-test-main

/test pull-cluster-api-test-mink8s-main

/test pull-cluster-api-verify-main

The following commands are available to trigger optional jobs:

/test pull-cluster-api-apidiff-main

Use /test all to run the following jobs that were automatically triggered:

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[chrischdi]

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

[chrischdi]

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

[k8s-ci-robot]

@chrischdi: 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-apidiff-main	3705f24	link	false	/test pull-cluster-api-apidiff-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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[chrischdi]

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

[chrischdi]

cc @nrb

[k8s-ci-robot]

PR needs rebase.

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