[WIP] ✨💣✨ [DNR][POC] Drop v1alpha3 & v1alpha4 apiVersions

[sbueringer]

What this PR does / why we need it:
Just playing around with dropping v1alpha3 & v1alpha4 apiVersions at this point

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 #

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by:
Once this PR has been reviewed and has the lgtm label, please ask for approval from sbueringer. For more information see the Code Review Process.

The full list of commands accepted by this bot can be found here.

Needs approval from an approver in each of these files:

• OWNERS

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[k8s-ci-robot]

This PR is currently missing an area label, which is used to identify the modified component when generating release notes.

Area labels can be added by org members by writing /area ${COMPONENT} in a comment

Please see the labels list for possible areas.

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]

/close

Will open an issue/PR soon to tackle the CRD migration removal problem

[k8s-ci-robot]

@sbueringer: Closed this PR.

In response to this:

/close

Will open an issue/PR soon to tackle the CRD migration removal problem

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.