Remove the obsolete atest-py3-prebuilt module am: a49018cb8f

Original change: https://android-review.googlesource.com/c/platform/prebuilts/asuite/+/3059169

Change-Id: Iff9d1c0251a1bba0798b6efdb047f04c42cefb97
Signed-off-by: Automerger Merge Worker <[email protected]>