Merge branch 'log-average-load' into 'master'

Log average load for RSpec

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/140486



Merged-by: Peter Leitzen <pleitzen@gitlab.com>
Approved-by: Peter Leitzen <pleitzen@gitlab.com>
Co-authored-by: Lin Jen-Shin <jen-shin@gitlab.com>