Add coex tests.

There is no major coex work reamining, but there were some minor changes suggested when it was put on hold. Deffering that to new bugs or feature requests.
These tests cover most of the new functionality, but there are still gaps in coverage for each prompt variation.

Fix: 222119218
Test: atest AuthBiometricFingerprintViewTest AuthBiometricFingerprintAndFaceViewTest AuthContainerViewTest
Change-Id: I0c9da2cd59a0e4fafd0fc53dfc55ced74d91789c