feat: throw ValidationError instead of untyped errors in L1s

[mrgrain]

Issue

All L1s for #32569

Description of changes

Updated the codegen to throw the correct error.
Instead of

throw new Error("Unexpected IResolvable");

we now throw

throw new errors.ValidationError("Unexpected IResolvable", scope);

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

[kaizencc]

approved, but i assume you'll want to wait until s3/validation-error is merged?

[aws-cdk-automation]

AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: a08e441
• Result: FAILED
• Build Logs (available for 30 days)

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

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.49%. Comparing base (61e876b) to head (a08e441).

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #33032   +/-   ##
=======================================
  Coverage   81.49%   81.49%           
=======================================
  Files         224      224           
  Lines       13755    13755           
  Branches     2413     2413           
=======================================
  Hits        11209    11209           
  Misses       2273     2273           
  Partials      273      273           

Flag	Coverage Δ
suite.unit	81.49% <ø> (ø)

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

Components	Coverage Δ
packages/aws-cdk	80.85% <ø> (ø)
packages/aws-cdk-lib/core	82.15% <ø> (ø)

This will need more changes. Dismissing review to force a re-review later.

[mrgrain]

Drafting the PR. This clearly needs more work.