remove console v1alpha1 which was present since 4.12

[deads2k]

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[openshift-ci]

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[jhadvig]

/lgtm

[openshift-ci]

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This pull-request has been approved by: deads2k, jhadvig

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[jhadvig]

@deads2k tagging the PR
Just a question, is it by design that the v1alpha1 version stays in the v1 crd ?
Also will open an followup to remove the conversion webhook server.