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This also packages the updater.exe into the same zip. From here, we'll
build a thin signing pipeline in the signing service to unpack the zip
and run the code.

The .exe upload can be removed later once the new system is working.

Bug: 926234
Change-Id: Ia23999927519fa93b9164bfac42357d41ae6c422
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2443216Reviewed-by: Michael Moss <mmoss@chromium.org>
Commit-Queue: Joshua Pawlicki <waffles@chromium.org>
Cr-Commit-Position: refs/heads/master@{#813293}