fix: export errors to make it available in region-info/lib/fact.ts

[iankhou]

Issue #34690

Closes #34690

Reason for this change

PR #33384 released in version 2.200.1 of @aws-cdk/region-info imported UnscopedValidationError from aws-cdk-lib/core/lib/errors, but did not export errors.js properly from aws-cdk-lib. This resulted in the following error message when attempting to import { Fact } from '@aws-cdk/region-info' (fact.ts imports UnscopedValidationError).

❯ node test.js
node:internal/modules/cjs/loader:1228
  throw err;
  ^

Error: Cannot find module 'aws-cdk-lib/core/lib/errors'
Require stack:
- /Volumes/workplace/test-region-info-app/node_modules/@aws-cdk/region-info/lib/fact.js
- /Volumes/workplace/test-region-info-app/node_modules/@aws-cdk/region-info/lib/index.js
- /Volumes/workplace/test-region-info-app/test.js
    at Module._resolveFilename (node:internal/modules/cjs/loader:1225:15)
    at Module._load (node:internal/modules/cjs/loader:1051:27)
    at Module.require (node:internal/modules/cjs/loader:1311:19)
    at require (node:internal/modules/helpers:179:18)
    at Object.<anonymous> (/Volumes/workplace/test-region-info-app/node_modules/@aws-cdk/region-info/lib/fact.js:8:18)
    at Module._compile (node:internal/modules/cjs/loader:1469:14)
    at Module._extensions..js (node:internal/modules/cjs/loader:1548:10)
    at Module.load (node:internal/modules/cjs/loader:1288:32)
    at Module._load (node:internal/modules/cjs/loader:1104:12)
    at Module.require (node:internal/modules/cjs/loader:1311:19) {
  code: 'MODULE_NOT_FOUND',
  requireStack: [
    '/Volumes/workplace/test-region-info-app/node_modules/@aws-cdk/region-info/lib/fact.js',
    '/Volumes/workplace/test-region-info-app/node_modules/@aws-cdk/region-info/lib/index.js',
    '/Volumes/workplace/test-region-info-app/test.js'
  ]
}

Node.js v20.17.0

Description of changes

Exported errors.js from packages/aws-cdk-lib/package.json, which makes it available to @aws-cdk/region-info.

Describe any new or updated permissions being added

None.

Description of how you validated changes

Tested by hand after making this code change, using example code from the linked issue.

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

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AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: 0c367eb
• Result: SUCCEEDED
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