Merge branch 'pedropombeiro/415444/fix-n+1-flaky-test' into 'master'

Preload runner manager in :id/pipelines/:pipeline_id/jobs

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/153077



Merged-by: Peter Leitzen <pleitzen@gitlab.com>
Approved-by: Marius Bobin <mbobin@gitlab.com>
Approved-by: Peter Leitzen <pleitzen@gitlab.com>
Co-authored-by: Pedro Pombeiro <noreply@pedro.pombei.ro>