Merge "Drop .stubs from android.test.[base|runner|mock].stubs" am: 188ebc6a7f

Original change: https://android-review.googlesource.com/c/platform/cts/+/1353494

Change-Id: I63b970f7edbc554bea6e9a587a27b90ce88edbac
tree: 75c5f38db6201a40c548237aa551ca11e8267de0
  1. tests/