Add tests for helm deployment with `packaged' option

[hypnoglow]

Following #682

Also added testdata/foo helm chart (created using helm create foo) for further testing.

[hypnoglow]

I believe CI check issues are unrelated to this PR.

[dlorenc]

@hypnoglow can you rebase? the CI issues should be fixed at HEAD.

[hypnoglow]

@dlorenc done 👌

[googlebot]

So there's good news and bad news.

👍 The good news is that everyone that needs to sign a CLA (the pull request submitter and all commit authors) have done so. Everything is all good there.

😕 The bad news is that it appears that one or more commits were authored or co-authored by someone other than the pull request submitter. We need to confirm that all authors are ok with their commits being contributed to this project. Please have them confirm that here in the pull request.

Note to project maintainer: This is a terminal state, meaning the cla/google commit status will not change from this state. It's up to you to confirm consent of the commit author(s) and merge this pull request when appropriate.

[dgageot]

@hypnoglow I had to update the branch to merge it. Can you just confirm you are ok with that?

[hypnoglow]

@dgageot No problem, as long as everything works