feat: add tekton v1beta1 client

[eddycharly]

This PR adds tekton v1beta1 client.

[eddycharly]

@alvaroaleman this adds support for generating tekton client v1beta1. I'd like to give a try to supporting both v1alpha1 and v1beta1 side by side.

[eddycharly]

/test pull-test-infra-integration

[eddycharly]

/test pull-test-infra-integration

[eddycharly]

/test pull-test-infra-integration

[eddycharly]

/assign @spiffxp

[eddycharly]

@alvaroaleman can we merge this one ?

[qaifshaikh]

Can we get some help to merge this @cjwagner?

[qaifshaikh]

@spiffxp can you help out here?

[stevekuznetsov]

Sorry if I'm missing something, but why are we generating the tekton clients here (as opposed to importing them)?

[eddycharly]

@stevekuznetsov see https://github.com/kubernetes/test-infra/pull/27018

[stevekuznetsov]

Ah, yes, now I remember. Thank you :)

/lgtm /approve

Let's get this in, then

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: eddycharly, stevekuznetsov

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[eddycharly]

Thanks @stevekuznetsov !