test(ws): add safety prompt for E2E test execution

[Adembc]

This PR enhances the safety of running make test-e2e by implementing a confirmation prompt.

Why is this important?

The make test-e2e command executes tests on the current Kubernetes cluster. This can potentially disrupt a production environment, as the tests include cleanup operations such as deleting cert-manager after completion.

What changes were made?

1. Added a confirmation prompt before test execution:

   • Displays the current Kubernetes cluster context
   • Asks for user confirmation to proceed

2. Implemented a bypass option for CI/CD pipelines:

   • Set environment variable KUBEFLOW_TEST_PROMPT=FALSE to skip the prompt
   • The variable is case-insensitive (e.g., "FALSE", "false", or "False" are all valid)

3. User confirmation:

   • Accepts "yes" or "y" (case-insensitive) to proceed with the tests
   • Any other input will abort the operation

[thesuperzapper]

Thanks, for this @Adembc!

I have made wordings changes in f6b092b and it should be good to go now.

[google-oss-prow]

[APPROVALNOTIFIER] This PR is APPROVED

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[thesuperzapper]

/lgtm