feat(appsync): throw ValidationError instead of untyped errors

[HBobertz]

Issue

aws-appsync 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

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

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.78%. Comparing base (309df92) to head (35f30d3).

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #33206   +/-   ##
=======================================
  Coverage   80.78%   80.78%           
=======================================
  Files         232      232           
  Lines       14111    14111           
  Branches     2453     2453           
=======================================
  Hits        11400    11400           
  Misses       2431     2431           
  Partials      280      280           

Flag	Coverage Δ
suite.unit	80.78% <ø> (ø)

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

Components	Coverage Δ
packages/aws-cdk	79.51% <ø> (ø)
packages/aws-cdk-lib/core	82.17% <ø> (ø)

[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).

[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).

[aws-cdk-automation]

AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: 35f30d3
• 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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