fix: api-gateway JsonSchema additionalItems interface

[jusdino]

Issue #33878

Closes #33878.

Reason for this change

Fix a bug in the JsonSchema interface.

🚨 This is a breaking change, but should be acceptable, since the bug prevented use of the changed interface portion 🚨

Description of changes

Changing the JsonSchema.additionalItems type from JsonSchema[] to JsonSchema | boolean to match Json Schema Draft-04. This enables deployment of API Gateway models that include the additionalItems property.

Describe any new or updated permissions being added

None

Description of how you validated changes

Added an integration test to validate that it fixes the deployment issue.

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]

(This review is outdated)

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

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.38%. Comparing base (2dc5d70) to head (a11b526).

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #33879   +/-   ##
=======================================
  Coverage   82.38%   82.38%           
=======================================
  Files         120      120           
  Lines        6938     6938           
  Branches     1170     1170           
=======================================
  Hits         5716     5716           
  Misses       1119     1119           
  Partials      103      103           

Flag	Coverage Δ
suite.unit	82.38% <ø> (ø)

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Components	Coverage Δ
packages/aws-cdk	∅ <ø> (∅)
packages/aws-cdk-lib/core	82.38% <ø> (ø)

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[jusdino]

I think that the CodeBuild check is failing because this is a breaking API change. I'm not sure how to use allowed-breaking-changes.txt to indicate to the check that the break is intentional and should be OK. If I understand the breaking change policy for this project right, this break should be acceptable, since the bug that this PR fixes prevents use of the part of the interface that is changing.

[aws-cdk-automation]

AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: a11b526
• Result: FAILED
• Build Logs (available for 30 days)

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