[FEATURE] Provide a Spec guideline for CRs for moving to v1beta1

[qu1queee]

Is there an existing feature request for this?

• [X] I have searched the existing feature requests

Is your feature request related to a problem or use-case? Please describe.

We need to document in a table, how can a user move out their CRs from v1alpha1 to v1beta1. Here I mainly refer to the spec paths. Similar to what I see https://tekton.dev/docs/pipelines/migrating-v1beta1-to-v1/

Describe the solution that you would like.

A markdown file containing helpful information for anyone to modify their v1alpha1 CR into a v1beta1

Describe alternatives you have considered.

None

Anything else?

Applies to Builds, Buildruns