fix(s3): add support for uppercase characters in legacy bucket names

[5d]

Issue # (if applicable)

Closes #31731

Reason for this change

As @GavinZZ commented in issue #31731, the official AWS S3 documentation stated that uppercase characters were permitted in bucket names prior to March 1, 2018.

Description of changes

• add support for uppercase characters in legacy bucket names

Description of how you validated changes

• added new unit test cases and updated the integration test cases with legacy bucket names

Checklist

• [x] 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]

AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: 5015d9f5f44d0cc959b165f69b1fb8fe7be24a5b
• Result: SUCCEEDED
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