tests: fix bug in weekly regression
tests: fix bug in weekly regression

66a056b8 changed the weekly regression to use a single docker for
all GPU tests, to reduce how many times gem5 needed to be compiled.
However, in my local testing of that patch, gem5-resources was not
deleted until after the docker was created -- which causes a problem
when gem5-resources does not exist already from a prior run, since
the creation of the dockerfile requires it for HACC.  This commit
fixes this problem by moving the pull of gem5-resources to be before
anything else related to the GPU happens.

Change-Id: I006860204d03807d95628aa5dcf6e82d202fef9c
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/51907
Maintainer: Matt Sinclair <d2406197fb1bedd1e23c70c50c510ff0e9ab0f5b@gmail.com>
Maintainer: Bobby R. Bruce <b9dba908ffb6c6d8ffe449cc88b3709c13c485c2@ucdavis.edu>
Reviewed-by: Bobby R. Bruce <b9dba908ffb6c6d8ffe449cc88b3709c13c485c2@ucdavis.edu>
Tested-by: kokoro <2ac7b1f3fa578934c95181d4272be0d3bca00121@google.com>

gem5/gem5,gem5/gem5,gem5/gem5,gem5/gem5,gem5/gem5,gem5/gem5,gem5/gem5