build: run all unit tests on browserstack

[devversion]

• No longer runs tests on Saucelabs, because those jobs mostly time out, or are just flaky.
• Allows reconnecting of browsers, if they accidentally disconnect on BrowserStack.

Should improve test stability in combination with #9949

[devversion]

Test failures should be fixed by #9958. Going to re-run once that one is in.

[jelbourn]

Seems like BrowserStack also has disconnect problems?

[devversion]

It definitely has. But at least it runs more stable than Saucelabs. Also can be related to a flaky test, that is causing some serious performance issues.

[jelbourn]

I don't know if I want to totally eliminate SauceLabs from our setup. It's really only the IE11 runs that have consistently been a problem.

[devversion]

I don't agree with that IE flakiness though. Usually it's the whole setup that doesn't connect at all. Anyway, I kind of see that it's a bit too much removing it completely.

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