CI issues to resolve once upstream GitLab bugs are released

These CI issues can be resolved once some upstream bugs in GitLab are released:

• Failed macOS jobs leave behind read-only files from make distcheck which then cause subsequent build jobs to fail
  • Current workaround in lscsoft/lalsuite CI: c66df3d3
  • GitLab MR resolving the issue: gitlab-org/gitlab-runner!3726
  • Target GitLab release: 15.10
  • Target fix in lscsoft/lalsuite CI: remove .macos-job:after_script.
• default:timeout does not set default timeout for all CI jobs
  • Current workaround in lscsoft/lalsuite CI: 25cd9e58
  • GitLab issue: gitlab-org/gitlab#213634
  • Target GitLab release: ???
  • Target fix in lscsoft/lalsuite CI: replace .build-job:timeout with default:timeout

cc @adam-mercer