fix(eks): undefined constructor in custom resource

[MrArnoldPalmer]

When we upgraded the proxy-agent v6 we did not update how we were importing from the package. Where in 5.0 commonjs exports were used , in 6.0 a named esm export is used.

Updated to use a named import statement instead of a default require. Typescript also confirms the old import was an error now since we use import instead of require.

Fixes: #26771

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[MrArnoldPalmer]

I ran the eks-cluster integ test using --force because it doesn't have diffAssets enabled. I confirmed that this test was failing with the expected error before. I did not --force the run of all of the other eks integ tests because they take literally forever.

We should diffAssets on all of these tests but it results in needing to re-run them on a cadence that is currently intolerable without automation doing it for us.

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[aws-cdk-automation]

AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: 9d28930
• Result: SUCCEEDED
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[mergify]

Thank you for contributing! Your pull request will be updated from main and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).