Add example which uses Web Test Runner (@web/test-runner)

[trivikr]

Is your feature request related to a problem? Please describe.

Karma was marked as deprecated on Apr 27, 2023 in karma-runner/karma#3846
Karma is widely used for real browser testing, and mswjs had provided an official example in https://github.com/mswjs/examples/tree/master/examples/with-karma

The maintainer team of karma has recommended Web Test Runner and jasmine-browser-runner as alternatives.
The former has backing from Chrome/BrowserStack/Netlify/SauceLabs, and has more npm downloads as well as GitHub stars.

Describe the solution you'd like

Add an example which shows how to use @web/test-runner with mswjs

Describe alternatives you've considered

N/A