Revert "Remove unneeded scripts for d8, r8-compat-proguard and retrace." am: e89c784a1d am: 4be3d43770

Original change: https://android-review.googlesource.com/c/platform/prebuilts/r8/+/2058488

Change-Id: I7084d521d5a886b44664755bd734456c5d3da4ad
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>