Verbose error on missing variable for e2e if HELM_VERSION is not set

[rlewkowicz]

It's 4 lines that can save some time and energy for people that might not be familiar with the process. Just an error message for e2e

[kingdonb]

Thanks for contributing here! We are not going to make any changes right now for the CI, Flux v1 and Helm Operator is in maintenance mode

Closing, stale.

Sorry for the delay in response, if you have questions welcome to reopen this or a new issue.