feat(eks): make kubectlLayer property required from optional

[xazhao]

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• 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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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.40%. Comparing base (3fbc785) to head (4275cea).
Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #32930   +/-   ##
=======================================
  Coverage   81.40%   81.40%           
=======================================
  Files         223      223           
  Lines       13727    13727           
  Branches     2411     2411           
=======================================
  Hits        11175    11175           
  Misses       2274     2274           
  Partials      278      278           

Flag	Coverage Δ
suite.unit	81.40% <ø> (ø)

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Components	Coverage Δ
packages/aws-cdk	80.74% <ø> (ø)
packages/aws-cdk-lib/core	82.10% <ø> (ø)

✅ Updated pull request passes all PRLinter validations. Dismissing previous PRLinter review.

[aws-cdk-automation]

AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: dc8d9d0
• Result: FAILED
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