feat: [ISSUE-1401]: Added helm get values option in Helm collector

[avaakash]

Description, Motivation and Context

This PR adds the helm values collection enhancement to Helm collector.
For more information, refer to this issue: #1401

Checklist

• New and existing tests pass locally with introduced changes.
• Tests for the changes have been added (for bug fixes / features)
• The commit message(s) are informative and highlight any breaking changes
• Any documentation required has been added/updated. For changes to https://troubleshoot.sh/ create a PR here

Does this PR introduce a breaking change?

• Yes
• No

[CLAassistant]

All committers have signed the CLA.

[banjoh]

Thanks a lot for your contribution!

The overall change looks good to me. I have added some comments, mostly around cleanup and some improvements I noticed that need to be done

The other missing bit that would be needed in this PR is

• Documenting the helm collector in this file
• Updating this e2e test. It will involve adding some values the helm test fixture and passing in some values which you will assert their existence here

[banjoh]

Error handling changes look good, thanks for that. I have added one code suggestion to the PR

[banjoh]

Docs PR: replicatedhq/troubleshoot.sh#534

[banjoh]

The PR changes work. I added one last comment needing to be changes

[banjoh]

LGTM