feat(region-info): throw ValidationError instead of untyped Errors

[mrgrain]

Issue

Relates to #32569

Description of changes

ValidationErrors where apprporiate

Note that files in the build-tools directory are excluded from the linter rules, since they are only used at build time.
I moved the before function to build-tools because it's not exported and only used at build time. Importing the core module to a build-time script doesn't work as it would add A LOT of additional files to the build-time hot path and that just completely blows the build script up 💥 (aside from it being totally unnecessary anyway).

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

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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

[aws-cdk-automation]

(This review is outdated)

[mrgrain]

UnscopedValidationError because this module doesn't operate on scopes

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

super old approval

[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).

[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: f4a2217
• Result: SUCCEEDED
• Build Logs (available for 30 days)

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[github-actions]

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