[gitlab-ci] Use project based include rather than hardcoded path

2 jobs for gitlab_relative_include in 11 minutes and 5 seconds (queued for 9 seconds)
Status Job ID Name Coverage
  Build
passed #246703
docker
build_linux_38

00:05:58

74.0%
passed #246702
intel macos
build_macos_intel_38

00:11:05

74.0%