This applies the 127GB default WCOW Sandbox size to not just `RUN` under
`docker build` (as was previously the case) but to `COPY` and `ADD`
under `docker build` and also to `docker run`.
It also removes an inconsistency that the 127GB size was not applied
when `--platform windows` was not passed to `docker build`, but WCOW was
still used as a platform default, e.g. Docker Desktop for Windows in
Windows Containers mode.
Signed-off-by: Paul "TBBle" Hampson <Paul.Hampson@Pobox.com>
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