[flexiglass] Parameterize SensitiveContentCoordinatorTest

SensitiveContentCoordinatorTest already has some SceneContainer
dependent code, so let's parameterize the existing tests.
This Cl also migrates this class to mockito-kotlin.

Bug: 379825109
Test: atest SensitiveContentCoordinatorTest
Flag: TEST_ONLY
Change-Id: I842f0484fb0f832e03f51f357c90205ab0c7711d