Cleanup change generated by Refaster (go/refaster) to directories //third_party/java_src/android_app/live_channels/tests/unit/src/...:all with template java/com/google/devtools/javatools/refactory/refaster/cleanups:TruthMigration

Also added some javadoc and stopped using MoreAsserts

PiperOrigin-RevId: 186830589
Change-Id: I277cf771e3eb7b2f1656810655fe68ac30811cca
11 files changed