fix(aws-s3): unable to use bucket from bucket name on legacy s3 bucket with underscore in the name

[chicken-teriyaki-cup-rice]

Fixes #22640

This code now checks for letters, numbers, periods, hyphens, AND underscores and throws an error if any other character is found.

• All tests passing

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[gitpod-io]

[aws-cdk-automation]

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[aws-cdk-automation]

The pull request linter fails with the following errors:

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

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[aws-cdk-automation]

AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: 9376e70
• Result: SUCCEEDED
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