Validate MachineController/OperatingSystemManager and cloudProvider None are mutually exclusive

[kron4eg]

Which issue(s) this PR fixes:

Fixes #3366

What type of PR is this?
/kind bug

Special notes for your reviewer:

Does this PR introduce a user-facing change? Then add your Release Note here:

Validate MachineController/OperatingSystemManager and cloudProvider None are mutually exclusive

Documentation:

NONE

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[kubermatic-bot]

@kron4eg: 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-kubeone-e2e-aws-default-install-containerd-external-v1.31.0	2918dda	link	true	/test pull-kubeone-e2e-aws-default-install-containerd-external-v1.31.0

Full PR test history

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[xmudrii]

As stated in #3366 (comment), we shouldn't forbid this, but properly handle it