Update deprecated RunKubectlE with RunKubectlContextE

[wcarlsen]

Describe your changes

Update deprecated RunKubectlE with RunKubectlContextE, since they will be removed in future releases https://github.com/gruntwork-io/terratest/releases/tag/modules%2Fcore%2Fv2.0.0-beta.1.

Issue ticket number and link

Checklist before requesting a review

• I have tested changes in my sandbox
• I have added the needed changes in the test/integration folder to apply my changes in QA. Read the guide on adding environment variables in QA
• I have rebased the code to master (or merged in the latest from master)

Is it a new release?

• Apply a release tag release:(major|minor|patch), following semantic versioning in this guide or norelease if there is no changes to the Terraform code

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