fix(s3-notifications): unable to delete the existing S3 event notifications (under feature flag)

[sarangarav]

Issue # (if applicable)

Closes #28915

Reason for this change

Fix to address the issues deleting the existing S3 event notifications and adding new event notifications on top of existing notifications.

Description of changes

We fixed the hashing logic used to identify old vs external S3 event notifications

Description of how you validated changes

Manually tested, integration and unit tested the changes

yes

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: f39ae7ad615b5c7cf8f1640dc356644e965d874e
• Result: SUCCEEDED
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