Deprecate code in goyaml.v2 (and v3) directories and redirect to equivalents in go.yaml.in/yaml/v2 (and v3)

[dims]

Context: please see kubernetes/kubernetes#132056

Let us get us and everyone else to move to the revived repos under YAML org:

• https://pkg.go.dev/go.yaml.in/yaml/v2
• https://pkg.go.dev/go.yaml.in/yaml/v3

Follows the suggestion laid out by @thockin in:
kubernetes/kubernetes#132056 (comment)

[dims]

/assign @thockin @liggitt

[liggitt]

it would be helpful to have the question at kubernetes/kubernetes#132056 (comment) answered before we make this change ... knowing the intent of the upstream in terms of activity, changes, churn, etc, would be really helpful

[ingydotnet]

it would be helpful to have the question at kubernetes/kubernetes#132056 (comment) answered before we make this change ... knowing the intent of the upstream in terms of activity, changes, churn, etc, would be really helpful

kubernetes/kubernetes#132056 (comment)

@liggitt does that work?

[liggitt]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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[dims]

xref: kubernetes/kubernetes#132056