Remove go/v2 plugin option

[camilamacedo86]

What do you want to happen?

Remove the implementation of go/v2 plugin and the tests and samples which still used by it.
We should also remove the legacy Project layout v2.

Note that we plan to do that when we bump k8s 1.26 ONLY.

Extra Labels

No response

[jmrodri]

/label triage/accepted

[k8s-ci-robot]

@jmrodri: The label(s) /label triage/accepted cannot be applied. These labels are supported: api-review, tide/merge-method-merge, tide/merge-method-rebase, tide/merge-method-squash, team/katacoda, refactor. Is this label configured under labels -> additional_labels or labels -> restricted_labels in plugin.yaml?

In response to this:

/label triage/accepted

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[camilamacedo86]

Closing in favor of: #3603