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

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

Change-Id: Id03e3f373e3373931a73da50a2f974b8ab0a8d74
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>