ENH - Add Playwright for automated testing

[kcpevey]

Fixes #290

Description

This pull request:

• adds playwright tests
  • these run inside and outside of pytest
• grabs some screenshots and uploads as artifacts (most for demo purposes, as docs are developed, these can modified/expanded)
• saves a video of the playwright test
• adds running the playwright tests and the yarn test in the github ci

Pull request checklist

• Did you test this change locally?
• Did you update the documentation (if required)?
• Did you add/update relevant tests for this change (if required)?

Additional information

[trallard]

Is this ready for review @kcpevey?

[kcpevey]

I just can't get the ports sorted out inside of CI. My local setup has to be different because I can't use 5000 so I switch to 8080 then the new UI shows up on 8081. What's happening on CI is totally different and I dont understand it. I dont have time to debug this this week. If someone else wants to have a look that would be great.

Once the ports are specified correctly, I expect this to pass.

[steff456]

Left a couple of questions, I'm a little puzzled because there's a mix of the use of the port 5000, 8080 and 8081 that I think may be causing the failures.

[kcpevey]

This is ready for final review @steff456

[steff456]

Left one question, overall this PR looks really good @kcpevey!

[steff456]

LGTM!