chore: convert SkipReplicaDeletion custom resource property to boolean for replica table (#34056)

### Issue # (if applicable)

Closes NA

### Reason for this change

Currently CloudFormation sends the DynamoDB table replica `onEvent` and `isComplete` handler requests with 
`skipReplicaDeletion` property as string (e.g., "true") rather than boolean (true). Cloudformation converts non string to string for custom resource properties when calling the handler. However, the handlers 
were checking for boolean value which caused the `isComplete` handler to timeout during delete operation 
when `skipReplicaDeletion` was enabled. This property was introduced in this PR #33953

### Description of changes
Modified both `onEvent` and `isComplete` handlers to explicitly convert `skipReplicaDeletion` from 
  string to boolean using comparison.

### Describe any new or updated permissions being added

NA

### Description of how you validated changes

Ran Unit test

### Checklist
- [x] My code adheres to the [CONTRIBUTING GUIDE](https://github.com/aws/aws-cdk/blob/main/CONTRIBUTING.md) and [DESIGN GUIDELINES](https://github.com/aws/aws-cdk/blob/main/docs/DESIGN_GUIDELINES.md)

----

*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*

Author: godwingrs22

packages/@aws-cdk-testing/framework-integ/test/aws-dynamodb/test/integ.global-replicas-provisioned.js.snapshot/asset.7e256f5e4a92713cc232cd23819cb666756ee6023ce380130abac3b6a3fcea6a/index.js

@@ -291,7 +291,7 @@
        {
         "Fn::Sub": "cdk-hnb659fds-assets-${AWS::AccountId}-${AWS::Region}"
        },
-       "/db84cdae632e6cba2f8e4a431d3f3a350218ac90c39e5eb62fff4a6737994230.json"
+       "/6404b9024d11579260b30a5c13511e95bdd5ff70c55d7879655b34940a2ca38a.json"
       ]
      ]
     }

packages/@aws-cdk-testing/framework-integ/test/aws-dynamodb/test/integ.global-replicas-provisioned.js.snapshot/asset.beee194466d406430def0e84ec8b17a0aeb98fe29f5660882cb01e9db355d7c8/index.js

@@ -250,7 +250,7 @@
      "S3Bucket": {
       "Fn::Sub": "cdk-hnb659fds-assets-${AWS::AccountId}-${AWS::Region}"
      },
-     "S3Key": "beee194466d406430def0e84ec8b17a0aeb98fe29f5660882cb01e9db355d7c8.zip"
+     "S3Key": "7e256f5e4a92713cc232cd23819cb666756ee6023ce380130abac3b6a3fcea6a.zip"
     },
     "Handler": "index.onEventHandler",
     "Role": {
@@ -313,7 +313,7 @@
      "S3Bucket": {
       "Fn::Sub": "cdk-hnb659fds-assets-${AWS::AccountId}-${AWS::Region}"
      },
-     "S3Key": "beee194466d406430def0e84ec8b17a0aeb98fe29f5660882cb01e9db355d7c8.zip"
+     "S3Key": "7e256f5e4a92713cc232cd23819cb666756ee6023ce380130abac3b6a3fcea6a.zip"
     },
     "Handler": "index.isCompleteHandler",
     "Role": {