Migrate BackgroundDexOptServiceIntegrationTests to androidx.test

See go/jetpack-test-android-migration

Partial cherry-pick of commit a86ec10b96244a32931cd2949be0f55ee3ea14c8.

Test: atest BackgroundDexOptServiceIntegrationTests
Change-Id: I15d10a1962210cde7e079590437009f6a5938db2
Merged-In: I32fe3297656eec6060da6c7e24582bcd5315fb16
4 files changed