feat(apprunner): throw ValidationError instead of untyped errors

[mazyu36]

Issue # (if applicable)

aws-apprunner-alpha for #32569

Description of changes

ValidationErrors everywhere

Describe any new or updated permissions being added

n/a

Description of how you validated changes

Existing tests. Exemptions granted as this is basically a refactor of existing code.

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

[mazyu36]

Exemption Request: Only updated Error to ValidationErrors.

[aws-cdk-automation]

(This review is outdated)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.35%. Comparing base (b9cb47c) to head (19e500e).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #33914   +/-   ##
=======================================
  Coverage   82.35%   82.35%           
=======================================
  Files         120      120           
  Lines        6941     6941           
  Branches     1172     1172           
=======================================
  Hits         5716     5716           
  Misses       1120     1120           
  Partials      105      105           

Flag	Coverage Δ
suite.unit	82.35% <ø> (ø)

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Components	Coverage Δ
packages/aws-cdk	∅ <ø> (∅)
packages/aws-cdk-lib/core	82.35% <ø> (ø)

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

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Pull request has been modified.

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[aws-cdk-automation]

AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: 19e500e
• Result: SUCCEEDED
• Build Logs (available for 30 days)

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[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).

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