refactor(cli): remove unused code

[mrgrain]

Reason for this change

This file is completely unused in our code base.
The test also doesn't test anything by indirection.

Description of changes

Removed the unused file and test.

Describe any new or updated permissions being added

n/a

Description of how you validated changes

Searched for the function on GitHub and internally. All found references are copies of the CDK code base and don't represent actual usage of the exported function.

Checklist

• My code adheres to the CONTRIBUTING GUIDE and DESIGN GUIDELINES

---

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license

[aws-cdk-automation]

The pull request linter fails with the following errors:

❌ CLI code has changed. A maintainer must run the code through the testing pipeline (git fetch origin pull/33096/head && git push -f origin FETCH_HEAD:test-main-pipeline), then add the 'pr-linter/cli-integ-tested' label when the pipeline succeeds.

If you believe this pull request should receive an exemption, please comment and provide a justification. A comment requesting an exemption should contain the text Exemption Request. Additionally, if clarification is needed, add Clarification Request to a comment.

[mrgrain]

Added pr-linter/cli-integ-tested but didn't actually do that. Seems low risk and the change will go through the pipeline on main anyway.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.51%. Comparing base (e4703c1) to head (f25ffaa).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #33096      +/-   ##
==========================================
- Coverage   81.52%   81.51%   -0.02%     
==========================================
  Files         224      223       -1     
  Lines       13762    13752      -10     
  Branches     2414     2413       -1     
==========================================
- Hits        11220    11210      -10     
  Misses       2270     2270              
  Partials      272      272              

Flag	Coverage Δ
suite.unit	81.51% <ø> (-0.02%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Components	Coverage Δ
packages/aws-cdk	80.90% <ø> (-0.03%)	⬇️
packages/aws-cdk-lib/core	82.15% <ø> (ø)

✅ Updated pull request passes all PRLinter validations. Dismissing previous PRLinter review.

[aws-cdk-automation]

AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: f25ffaa
• Result: SUCCEEDED
• Build Logs (available for 30 days)

Powered by github-codebuild-logs, available on the AWS Serverless Application Repository

[mergify]

Thank you for contributing! Your pull request will be updated from main and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).

[mrgrain]

Force merged to bypass Codecov for this dead code removal PR.

[github-actions]

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