Reland "Updater: Attempt to fix nondeterministic builds."

This is a reland of commit d1eb9b6e

Original change's description:
> Updater: Attempt to fix nondeterministic builds.
>
> By eliminating the copy and building directly into the bundle dir, we
> avoid the undefined order of the copy vs link steps. (Note: it is not
> sufficient to have the link step depend on the copy.)
>
> Change-Id: I043b4ddb617e94cf8eb47d4a483002fef7bed89a
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4341837


> Reviewed-by: Noah Rose Ledesma <noahrose@google.com>
> Auto-Submit: Joshua Pawlicki <waffles@chromium.org>
> Commit-Queue: Noah Rose Ledesma <noahrose@google.com>
> Commit-Queue: Joshua Pawlicki <waffles@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#1118666}

Change-Id: I65fa44a9f588969f0687155a3528fb8f6eda26b1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4347599


Reviewed-by: Noah Rose Ledesma <noahrose@google.com>
Commit-Queue: Joshua Pawlicki <waffles@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1118945}