feat(xo-server/self service): admins alway bypass quotas

[julien-f]

Description

Fixes #27050 Fixes https://team.vates.fr/vates/pl/jb5xsh3bijf17fjokq3uczg4bo

Untested

Checklist

• Commit
  • Title follows commit conventions
  • Reference the relevant issue (Fixes #007, See xoa-support#42, See https://...)
  • If bug fix, add Introduced by
• Changelog
  • If visible by XOA users, add changelog entry
  • Update "Packages to release" in CHANGELOG.unreleased.md
• PR
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