fix: multiple kubectl help/usage bugs

[starpit]

Fixes #4342

Description of what you did:

My PR is a:

• 💥 Breaking change
• 🐛 Bug fix
• 💅 Enhancement
• 🚀 New feature

Please confirm that your PR fulfills these requirements

• Multiple commits are squashed into one commit.
• The commit message follows Conventional Commits, which allows us to autogenerate release notes; e.g. fix(plugins/plugin-k8s): fixed annoying bugs
• All npm dependencies are pinned.

[codecov]

Codecov Report

Merging #4343 into master will increase coverage by 0.08%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #4343      +/-   ##
==========================================
+ Coverage   59.41%   59.50%   +0.08%     
==========================================
  Files          74       74              
  Lines        2400     2400              
  Branches      583      583              
==========================================
+ Hits         1426     1428       +2     
+ Misses        747      743       -4     
- Partials      227      229       +2     

Impacted Files	Coverage Δ
packages/core/src/core/command-tree.ts	70.43% <0.00%> (+0.86%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 233aae6...81dd411. Read the comment docs.