feat(rds): throw ValidationError instead of untyped errors

[kaizencc]

Issue

aws-rds 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

[aws-cdk-automation]

The pull request linter fails with the following errors:

❌ Features must contain a change to a README file.
❌ Features must contain a change to a test file.
❌ Features must contain a change to an integration test file and the resulting snapshot.

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 81.52%. Comparing base (ed7d54d) to head (7460c65).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #33042   +/-   ##
=======================================
  Coverage   81.52%   81.52%           
=======================================
  Files         224      224           
  Lines       13762    13762           
  Branches     2414     2414           
=======================================
  Hits        11220    11220           
  Misses       2270     2270           
  Partials      272      272           

Flag	Coverage Δ
suite.unit	81.52% <ø> (ø)

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

Components	Coverage Δ
packages/aws-cdk	80.93% <ø> (ø)
packages/aws-cdk-lib/core	82.15% <ø> (ø)

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

[mrgrain]

@Mergifyio update

[mergify]

update

✅ Branch has been successfully updated

[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: 7460c65
• Result: SUCCEEDED
• Build Logs (available for 30 days)

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

[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).

[github-actions]

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