feat: add optional aws region to cdn bucket config

[akshaymagapu]

Summary

This PR adds optional region support to cdnBucketConfig and validates AWS-style region formats.

Changes

• Added optional region to the Zod schema in packages/spacecat-shared-utils/src/schemas.js.
• Added optional region validation to the Joi schema in packages/spacecat-shared-data-access/src/models/site/config.js.
• Added tests for:
  • valid region format: us-east-1
  • invalid region format: us_east_1

Validation

• npm test -w @adobe/spacecat-shared-utils -- test/schemas.test.js
• npx mocha --require ./test/setup-env.js --spec "test/unit/models/site/config.test.js" --grep "cdnBucketConfig region|cdn bucket config|validateConfiguration Function"

Example

cdnBucketConfig: {
  bucketName: 'my-bucket',
  allowedPaths: ['/logs/'],
  cdnProvider: 'aws',
  region: 'us-east-1', // optional
}

[github-actions]

This PR will trigger a minor release when merged.

[solaris007]

🎉 This PR is included in version @adobe/spacecat-shared-data-access-v3.9.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot 📦🚀

[solaris007]

🎉 This PR is included in version @adobe/spacecat-shared-utils-v1.100.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot 📦🚀