Improve kubectl plugin resolution for non-shadowing subcommands

[ardaguclu]

Enhancement Description

• One-line enhancement description (can be used as a release note): Improve kubectl plugin resolution for non-shadowing subcommands
• Kubernetes Enhancement Proposal: https://github.com/kubernetes/enhancements/tree/master/keps/sig-cli/3638-kubectl-plugin-subcommands
• Discussion Link: September 21, 2022 sig-cli bi-weekly meeting
• Primary contact (assignee): @ardaguclu
• Responsible SIGs: sig-cli
• Enhancement target (which target equals to which milestone):
  • Alpha release target (x.y): 1.27
  • Beta release target (x.y): 1.29
  • Stable release target (x.y): 1.32
• Alpha
  • KEP (k/enhancements) update PR(s):
    • KEP-3638: Enable built-in command shadowing by plugins #3639
  • Code (k/k) update PR(s):
    • Enable plugin resolution as subcommand for selected builtin commands kubernetes#116293
  • Docs (k/website) update PR(s):
    • document plugin resolution as subcommand for builtin commands website#39969
• Beta
  • KEP (k/enhancements) update PR(s):
    • KEP-3638: Promotes plugin subcommand resolution to beta #4209
  • Code (k/k) update PR(s):
    • KEP-3638: Promote plugin resolution to beta kubernetes#120663
  • Docs (k/website) update PR(s):
    • Remove alpha environment variable because feature is in beta website#43048

[ardaguclu]

/milestone v1.27

[k8s-ci-robot]

@ardaguclu: You must be a member of the kubernetes/milestone-maintainers GitHub team to set the milestone. If you believe you should be able to issue the /milestone command, please contact your Milestone Maintainers Team and have them propose you as an additional delegate for this responsibility.

In response to this:

/milestone v1.27

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[ardaguclu]

/sig cli

[soltysh]

/assign @ardaguclu

[soltysh]

/milestone v1.27
/label lead-opted-in

[soltysh]

/stage alpha