Deprecate ancient errors/ package

[enxebre]

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

The /errors package has its origin in when capi providers were machineActuators that needed to vendor core capi to function.
There's no usage recommendations and value is questionable since we moved to CRDs and conditions for interoperability between core and providers.
I think we should deprecate it and if there's any use case relying on it we should support it via conditions

Detailed Description

The /errors package has its origin in when capi providers were machineActuators that needed to vendor core capi to function.
There's no usage recommendations and value is questionable since we moved to CRDs and conditions for interoperability between core and providers.
I think we should deprecate it and if there's any use case relying on it we should support it via conditions

Anything else you would like to add?

No response

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.

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