Remove MD5 output from build log
We don't need this step anymore: https://gitlab.com/gitlab-org/omnibus-gitlab/commit/b984b3acb3f03837cce20fc14878074aec043c32
This will reduce the amount of time it takes to render the output of build log (as thousands of now "useless" lines will be omitted).
https://dev.gitlab.org/gitlab/omnibus-gitlab/builds/144549 (old)
vs
https://dev.gitlab.org/gitlab/omnibus-gitlab/builds/145189 (now)