[e2e] Find a way to use different jest config files

[RobinCsl]

Problem

We have split views for tablets, and that means there are different behaviours, or scenarios, depending on whether you're on tablet or mobile. That means it is somewhat difficult to do e2e testing because of that in the current setup:
I would like to use <title>.tablet.spec.js for tablet specific e2e tests, but jest will pick on it even when executing yarn e2e-iphone, because I cannot specify that jest should ignore tablet.spec.js when executing that command.
Similarly, we could have <title>.phone.spec.js for phone specific e2e tests.
Finally, the tests <title>.spec.js would be general and apply to both phones and tablets.

The way detox can be configured at the moment only allows for one jest config file; it would be nice to allow more.

Any ideas? @tbergq

[ferrannp]

@RobinCsl Just throwing a guess here but https://jestjs.io/docs/en/configuration.html#projects-array-string-projectconfig the projects config might be useful for you.

[RobinCsl]

I will have a look at that, thanks @ferrannp!