Use the user policy when running the compatibility tests.

Bug: 74344625
Test: Built policy for many devices.  Booted one device.
Test: Delete some compat rules, verify error on userdebug.
Change-Id: Ib2df2dfc06cdf55a839011e9a528e76160a9e436
(cherry picked from commit c1486218)

When building userdebug or eng builds, we still want to build the user
policy when checking neverallow rules so that we can catch compile
errors.

Commit c0713e86 split out a helper function but lost one instance of
using user instead of the real variant.  This restores that one and
adds it to the neverallow check.

Bug: 74344625
Test: Added a rule that referred to a type defined only
in userdebug and eng and ensure we throw a compile error when building
userdebug mode.

Change-Id: I1a6ffbb36dbeeb880852f9cbac880f923370c2ae

Bug: 69390067
Test: policy builds
Change-Id: I9b29a88ec071a17fc429892b5a8720b15fcbcf32