Added updateEngine_downloadAction_fuzzer am: 55fec45931 am: b0bda4937f am: 8958261684 am: 8ea3c2d4a1

Original change: https://android-review.googlesource.com/c/platform/system/update_engine/+/1810483

Change-Id: I6e75b068beef18d3268b93fd7f74650a51fae957
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>