feat: add dynamic partition

[MichaelWalker-git]

Summary

This PR introduces two main updates to the project:

1. CDK Version Update and Deprecated Method Replacement:

   • Upgraded AWS CDK to version 2.164.1 to stay current and access new features and improvements.
   • Updated deprecated methods across various files to ensure compatibility with the latest CDK version, reducing technical debt and future-proofing the codebase.

2. Dynamic Partition Key for GovCloud Support:

   • Added dynamic partitioning to accommodate different AWS partitions (aws, aws-us-gov, etc.), making the code compatible with both commercial and GovCloud regions.
   • Leveraged Aws.PARTITION in ARN definitions to automatically adjust the partition prefix based on the environment, ensuring accurate ARN generation for S3, WorkMail, and other AWS services.

Changes

• Refactored ARN definitions to dynamically pull Aws.PARTITION where required.
• Updated policies and lambda environment variables to support both GovCloud and standard AWS regions.
• Made minor optimizations in variable declarations, converting var to const to enhance readability and prevent variable mutation.

Impact

• The updates ensure smoother deployments and executions in GovCloud environments while maintaining backward compatibility.
• The transition to dynamic partitioning enables this stack to be deployed across AWS commercial and GovCloud regions, providing broader support and flexibility.

Testing

• Integration tests were run to verify the correct ARN generation in GovCloud and commercial AWS environments.
• Policy checks were validated to ensure the appropriate permissions were granted dynamically based on region-specific requirements.

This PR addresses multi-region compatibility concerns and enhances the project's adaptability with the latest AWS CDK standards.