Enable EnforcePermission linters for test sources

Increase the scope of the linters to be executed even for tests.

Bug: 270596429
Test: m lint-check
Test: remove annotation and helper call in EnforcePermissionTestHelper;
      m lint-check; the two errors are raised.
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:d16e10024b498484f8ac8d7fefa7405093210fde)
Merged-In: Ic8348b668664747b8a1f3c56359cdf9c02132f59
Change-Id: Ic8348b668664747b8a1f3c56359cdf9c02132f59