minor documentation updates to development and test experience

[amold1]

General:

• [ ] Have you removed all sensitive information, including but not limited to access keys and passwords?
• [ ] Have you checked to ensure there aren't other open or closed Pull Requests for the same bug/feature/question?

Pull Request Guidelines:

1. [ ] Does your submission pass tests?
2. [ ] Have you added tests?
3. [ ] Are you addressing a single feature in this PR?
4. [ ] Are your commits atomic, addressing one change per commit?
5. [ ] Are you following the conventions of the language?
6. [ ] Have you saved your large formatting changes for a different PR, so we can focus on your work?
7. [ ] Have you explained your rationale for why this feature is needed?
8. [ ] Have you linked your PR to an open issue

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 53.08%. Comparing base (02c9b18) to head (06756ec). Report is 5 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #262 +/- ## ========================================== + Coverage 49.59% 53.08% +3.49% ========================================== Files 22 22 Lines 1587 1588 +1 ========================================== + Hits 787 843 +56 + Misses 750 700 -50 + Partials 50 45 -5 ```

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[amold1]

LTGM!

But could you also add some documentation about different labels you added to chainsaw tests and we can use E2E_SELECTOR env var to select? It would be valuable to document that and make it easily accessible for others!

done!