fix(eks): kubectl get handler output includes stderr

[kaizencc]

The custom resource that handles kubectl requests returns standard output and standard error in the same string. This is normally okay, because we likely get either a successful result with standard output, or an unsuccessful one with standard error. However, there are certain circumstances where kubectl returns a successful result with standard output as well as warnings in standard error. These warnings are harmless, but because of how the custom resource is set up, it corrupts the output that gets returned. This results in integ test failure.

These changes separate out standard output and standard error that gets returned by kubectl, and only prints the error if we mean to throw an error.

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[gitpod-io]

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[madeline-k]

There is still integration tests in step-functions whose snapshots were changed by this PR. Ideally we would not have to re-deploy this. Files names for nested stack templates where the only changes in those templates were asset hashes should also get ignored. But we don't have this functionality in the integ runner yet.

[aws-cdk-automation]

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• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: af3362c
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