chore: convert SkipReplicaDeletion custom resource property to boolean for replica table

[godwingrs22]

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

• My code adheres to the CONTRIBUTING GUIDE and DESIGN GUIDELINES

---

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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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.98%. Comparing base (994e952) to head (82af319).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #34056   +/-   ##
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  Coverage   83.98%   83.98%           
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  Files         120      120           
  Lines        6976     6976           
  Branches     1178     1178           
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  Hits         5859     5859           
  Misses       1005     1005           
  Partials      112      112           

Flag	Coverage Δ
suite.unit	83.98% <ø> (ø)

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Components	Coverage Δ
packages/aws-cdk	∅ <ø> (∅)
packages/aws-cdk-lib/core	83.98% <ø> (ø)

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AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: 82af319
• Result: SUCCEEDED
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