chore(cli): add explicit defaults to yargs definition

[kaizencc]

This makes sure we have a default value (even if its undefined) for every option in yargs.

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

[kaizencc]

this is what happens when i run jest -u on this file. please don't tell me that i have to update them manually to avoid ugly diff...

[mrgrain]

I think the linter will format it correctly for you

[kaizencc]

the linter doesn't help.. its something to do with my jest formatting i guess. i see previous bug reports about it but not sure why i'm coming across it

[kaizencc]

ugh, spent too much time on this. just formatted it correctly myself :/

[aws-cdk-automation]

The pull request linter has failed. See the aws-cdk-automation comment below for failure reasons. 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.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.21%. Comparing base (3377c3b) to head (ec4358c).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #32596      +/-   ##
==========================================
+ Coverage   79.15%   79.21%   +0.06%     
==========================================
  Files         107      107              
  Lines        7139     7146       +7     
  Branches     1321     1325       +4     
==========================================
+ Hits         5651     5661      +10     
+ Misses       1304     1302       -2     
+ Partials      184      183       -1     

Flag	Coverage Δ
suite.unit	79.21% <ø> (+0.06%)	⬆️

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

Components	Coverage Δ
packages/aws-cdk	79.21% <ø> (+0.06%)	⬆️

[aws-cdk-automation]

➡️ PR build request submitted to test-main-pipeline ⬅️

A maintainer must now check the pipeline and add the pr-linter/cli-integ-tested label once the pipeline succeeds.

[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/32596/head && git push -f origin FETCH_HEAD:test-main-pipeline), then add the 'pr-linter/cli-integ-tested' label when the pipeline succeeds.

PRs must pass status checks before we can provide a meaningful review.

If you would like to request an exemption from the status checks or clarification on feedback, please leave a comment on this PR containing Exemption Request and/or Clarification Request.

[aws-cdk-automation]

AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: ec4358c
• Result: FAILED
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