Fix NearbyConfigurationTest.

TestAppSupported Flag can be set to true only in user-debug devices.
Add conidtional testing for this test case.

Bug: 285234065
Ignore-AOSP-First: nearby_not_in_aosp_yet
Test: atest NearbyConfigurationTest
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:22b1e80835ec5bbacc7cb3bf88e072cfd8fcd8d9)
Merged-In: I14a7947f8a9178a1f97b5ed392882ab9f200eb89
Change-Id: I14a7947f8a9178a1f97b5ed392882ab9f200eb89