Replace Karma with another runner for browser tests

[frankhinek]

Rationale:

• Karma was deprecated on Apr 27, 2023
• Post deprecation, the project is "not accepting new features or general bug fixes.".
• Web5 SDK JS browser tests frequently timeout, particularly with Webkit, and have required significantly increasing the timeout on many of the Mocha/Chai tests (5, 10, and even 30 seconds). Despite this some tests still timeout. This leads to aggregate CI runtimes to be lengthened considerably.
• Web5 SDK JS browser tests take 20+ minutes to complete under GitHub CI which results in slow feedback loops.

Work to be done:

• First, propose a new approach/solution and get feedback from the project maintainers. Once an approach is agreed upon, then proceed with modifying the SDK repos and submit a PR. There are a number of other changes being contemplated with respect to tests, so that context should be incorporated in the plan to replace Karma.

[michaelneale]

its probably a little out dated but jasmine was my pick back in the day. Looking now Jest seems more popular (if that counts for anything)

[frankhinek]

Yea, Jest is still popular but it seems a lot of projects are migrating away. One of the reason some seem to be gravitating towards Vitest is that the API is fully Jest compatible. And it also supports the expect style tests from Chai, which means we wouldn't have to rewrite many of our tests to migrate.

Also Moe hates Jest so we had steered away from it early on 😄

[shamilovtim]

Did a deep dive and my conclusion is Jest is the way to go
TBD Testing Migration.pdf

[shamilovtim]

Found a way to replace Karma with zero changes to the test suite: https://github.com/TBD54566975/web5-js/pull/316/files. Still not as good as using Jest. But very simple to do.

[frankhinek]

Closing since Karma was replaced with Web Test Runner in #316