Revert "Remove unneeded scripts for d8, r8-compat-proguard and retrace." am: e89c784a1d am: 4be3d43770 am: 296202ca40

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

Change-Id: I41fb70e9348f7003ade34183fb1a10ea00c73c3b
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>