The ability to set slowTestThreshold per tag

[will-stone]

In our test pack we have some tests that we expect to be slow. It'd be great to be able to set the slowTestThreshold value per tag, that way we could tag the slow tests as "slow" and not affect us missing regular tests slowing down.

e.g. we currently have it set to 1000, but if every other test started clocking up to 900, then in aggregate we'd have a slow test suite, and these tests would go under the radar.

Keep up the good work! Love the project 🥳

[sheremet-va]

I think, this is a good idea 👍 Feel free to make a feature request/PR

[will-stone]

Thanks! 😄 Done: #10120