Investigate centos8 package size increase

The first EE nightly build of centos8 failed due to being too large: https://dev.gitlab.org/gitlab/omnibus-gitlab/-/jobs/6708880

We had previously capped the filesize at 800MB. I am bumping the size to 850MB for now to unblock builds. But we should investigate the size difference between centos8 and centos7 to try and find the cause of the increase.

We have seen similar increases in binary sizes with the new gcc in the latest debian, but this increase was even further, and needs to be investigated.