fix(dynamodb): fix addToResourcePolicy not adding any statements to the resource policy

[xonstone]

Issue # (if applicable)

Closes #30793.

Reason for this change

addToResourcePolicy has no effect on changesets.

Description of changes

Made this.resourcePolicy the target for synthesizing instead of props.resourcePolicy

Describe any new or updated permissions being added

NA

Description of how you validated changes

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

[aws-cdk-automation]

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❌ Fixes must contain a change to a test file.
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AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: 4c97746
• Result: FAILED
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