[upgrade] Start Jest test coverage

[iseabock]

Motivation and Context

Frontend should have a test suite to catch regressions and assert understood functionality.

Description

Within the frontend directory one can run npm run test to run current test suite.

More test to come and future integration into build pipeline possibly.

Contribution Checklist

• [x] I have built and tested the code locally and in a deployed app
• [x] For frontend changes, I have pulled the latest code from main, built the frontend, and committed all static files.
• [x] This is a change for all users of this app. No code or asset is specific to my use case or my organization.
• [x] I didn't break any existing functionality :smile:

[abhahn]

Thanks for adding this! Could you also add a step to the nodejs workflow to run the tests after the build? If it will be a lot of work, it's okay to also suggest it be a part of a separate PR. LMK what you think.