Merge branch 'cdot-5520-trueup' into 'master'

Use trueup_period_seat_count for true-up check

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/119001



Merged-by: Etienne Baqué <ebaque@gitlab.com>
Approved-by: Etienne Baqué <ebaque@gitlab.com>
Approved-by: Paulo Barros <pbarros@gitlab.com>
Reviewed-by: Mark Chao <mchao@gitlab.com>
Co-authored-by: Mark Chao <mchao@gitlab.com>