Add "Commentator" in various places where it's not visible right now

[FatzkeFTW]

Add "Commentator" as a column when exporting to CSV or JSON

[FatzkeFTW]

"Commentator" is also not visible in these places:
Discord Audit Log (both on new submission and submission update)
When viewing runs on https://submissions.esamarathon.com/dashboard/admin/runs (only when editing a run it becomes visible)