Improve invalid node kind errors

[KnVerey]

Also enhance this kind of error specifically in the namespace transformer, explaining to the user that it is probably a field spec issue. Also remove ignored field specs from that transformer's defaults, including two that are invalid in a way that would produce this message (but continuing to ignore the valid path).

@annasong20 was correct that it is the kyaml error package that is not working with errors.Is and errors.As. That is because it uses a very old version of its go-errors dependency, that didn't have go-1.13 style support. I think we are the reason k/k has this dep, and the diff to update all the way to latest is quite small in any case: go-errors/errors@v1.0.1...v1.4.2.

/cc @natasha41575

[k8s-ci-robot]

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[KnVerey]

/hold for rebase on #4704 when it merges (unless we change our mind about the order)

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[KnVerey]

This has been rebased, but it might be good to hold until after the next release in case the dep upgrade unexpectedly is in fact an issue for kubectl.

[KnVerey]

/unhold

This is ready for a look

[natasha41575]

Ah sorry I missed this PR

/lgtm
/approve

I can retag if you need to rebase

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: KnVerey, natasha41575

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[KnVerey]

@natasha41575 I rebased and added two new commits: one making an improvement I couldn't do in #4754 because of the go-errors version, and another committing go.sum changes. PTAL.

[natasha41575]

/lgtm