enh(ci): improve CI build
Description
Build time have strangely increased and one of the hypothesis is the PCH that have been turned on. We will try it off and compare build time (for the record, it is always more than 20 MN).
Proposal
just set -DSIGHT_ENABLE_PCH=OFF
in the .gitlab-ci.yml
Test plan
Wait and look at the build time on other job..