feat(backup): throw ValidationError instead of untyped Errors

[mrgrain]

Issue

Relates to #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 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]

(This review is outdated)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 80.92%. Comparing base (b91965c) to head (b8cb8f9).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #33387   +/-   ##
=======================================
  Coverage   80.92%   80.92%           
=======================================
  Files         236      236           
  Lines       14255    14255           
  Branches     2491     2491           
=======================================
  Hits        11536    11536           
  Misses       2434     2434           
  Partials      285      285           

Flag	Coverage Δ
suite.unit	80.92% <ø> (ø)

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Components	Coverage Δ
packages/aws-cdk	79.74% <ø> (ø)
packages/aws-cdk-lib/core	82.20% <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: b8cb8f9
• Result: SUCCEEDED
• Build Logs (available for 30 days)

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[mergify]

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