feat: Add Encryption to Log Retention

[surecloud-meason]

Issue # (if applicable)

Closes # #22961.

Reason for this change

We want to add the functionality to be able to create a log group from log retention that is able to be encrypted

Description of changes

Adds an optional kms key that can be passed to the custom resource that will encrypt the log group

Description of how you validated changes

Test added to validate the change

Checklist

• 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

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Your pull request must be based off of a branch in a personal account (not an organization owned account, and not the main branch). You must also have the setting enabled that allows the CDK team to push changes to your branch (this setting is enabled by default for personal accounts, and cannot be enabled for organization owned accounts). The reason for this is that our automation needs to synchronize your branch with our main after it has been approved, and we cannot do that if we cannot push to your branch.

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AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: 0ad2f5a
• Result: FAILED
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