Android: exclude the main apk deps from the test apk

[vaslabs]

This is related to #6064

after some investigation, I've realised we probably need to get the test apk as clean as possible from things that exist in the base apk.

I had to add the bom flag so that it can be used in the ad-hoc resolvers too

This is still a work in progress, currently only excluding the coursier directory files .

There also should be an easier implementation, but I'm trying several things at the moment

This PR is far from functional, just posting if someone knows a few tips on the best way to exclude the dependency tree of the app module from the androidTest one

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[vaslabs]

with the R8 classpath fix I'm very close to replicating the same test apk as gradle