Revert "Added updateEngine_downloadAction_fuzzer" am: 2bedf8ce32 am: 80433e81e5

Original change: https://android-review.googlesource.com/c/platform/system/update_engine/+/2055665

Change-Id: Ib86049146c9c10fd49eb6b1c9f6de2e5850cbce5
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>