[WIP] Improve kubectl.GetPrinter

[juanvallejo]

Fixes: #38779
Addresses an item from: #38768

Release note:

release-note-none

This patch prevents potential panics by callers of kubectl.GetPrinter by avoiding returning both a nil error and printer when the specified output format is wide.

I am hoping this can at least serve to start a discussion for how to handle this case in kubectl.GetPrinter. Both PrinterForMapping and PrinterForCommand make a call to kubectl.GetPrinter (PrinterForMapping calls this indirectly through a call to PrinterForCommand) and only avoid dealing with both a nil printer and nil error (when output format == wide) due to PrinterForCommand simply returning the results it receives from kubectl.GetPrinter, and PrinterForMapping creating an entirely new printer when this is the case.

An alternative solution to this could be to still return a nil printer in kubectl.GetPrinter, but return an error (such as unsupported output format) and have PrinterForCommand handle this error by either creating a NewHumanReadablePrinter at this point, or delegating the error to PrinterForMapping which already creates a NewHumanReadable printer when generic == false for kubectl.GetPrinter.

@fabianofranz

[k8s-ci-robot]

Hi @juanvallejo. Thanks for your PR.

I'm waiting for a kubernetes member to verify that this patch is reasonable to test. If it is, they should reply with @k8s-bot ok to test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[k8s-reviewable]

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[k8s-github-robot]

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[k8s-github-robot]

@juanvallejo PR needs rebase

[k8s-github-robot]

This PR hasn't been active in 92 days. Closing this PR. Please reopen if you would like to work towards merging this change, if/when the PR is ready for the next round of review.

cc @adohe @fabianofranz @juanvallejo @smarterclayton

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