Restructure integration_tests/androidx_test with sharedTest pattern

[utzcoz]

Description

Ideally, the tests under integration_tests/androidx_test can also run on real emulator. It's better if we can restructure this test module with sharedTest pattern(http://robolectric.org/blog/2021/10/06/sharedTest/), the same as ctesque. We can start to work for it after #6745 merged to reduce conflict problem, because it adds tests under integration_tests/androidx_test. After restructuring, related tests will be tested on emulator too at CI jobs.

Steps to Reproduce

None.

Robolectric & Android Version

Latest master branch.

Link to a public git repo demonstrating the problem:

Robolectric itself.