Remove Jest testing in favor of Vitest

[iseabock]

Motivation and Context

Jest testing can be incompatible with a Vite project in some cases.

Description

This PR removes Jest in favor of Vitest. Incidentally Vitest appears to run faster than Jest in Vite project/

Contribution Checklist

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