Add a test for a non-admin profile of admin parent requesting bugreport.

This new test would have caught the reverted change that did not
consider the case that non-admin profile of an admin parent requests a
bug report.

Fixes: 320470216

Test: atest com.android.server.os.BugreportManagerServiceImplTest

Change-Id: I0f751c409a20009b64bbeeca3c1a265fd79ca4e4