Add a separate setup-test-env-fips to compile for UBI

Previously Debian bullseye was used to compile Gitaly and Workhorse
for UBI images, which somehow worked even though bullseye ships with
glibc 2.31, while UBI 8.6 ships with glibc 2.28.

Debian bookwork ships with glibc 2.36 and produces Go binaries
that can't be run on UBI 8.6.

To fix this, we need a separate `setup-test-env-fips` step
that builds Go binaries with the appropriate UBI image.

Relates https://gitlab.com/gitlab-org/gitlab/-/issues/441444