Revert "Added updateEngine_downloadAction_fuzzer" am: 2bedf8ce32 am: 80433e81e5 am: 40056fee4d am: fbd81d342d

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

Change-Id: Ifb0f6a1d43ca648a6c4a60069b8f39acda1e7b1a
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>