Migrate remaining cts to androidx.test.

See go/jetpack-test-android-migration

Exempt-From-Owner-Approval: automated package name refactoring; already
reviewed+merged internally
Test: m cts

Change-Id: I6877435bf0436b8ef1dd252b225eac2908e78b71
Merged-In: I092c369229f8cb4c13827cbad4fd162622ac7849
1667 files changed