fix(test): fix ban unit tests to be dependent upon each other

[braindigitalis]

Fixes the ban set/unset/get unit tests to be properly dependent upon each other's callbacks (callback hell, yay) and also to use the IDs of valid users which should never be on a unit test server:

• MEE6
• Dyno
• MidJourney Bot

These 3 will remain valid for the forseeable future. using deleted user ids for bans is not a good idea, they eventually get purged and the side effects of adding bans for them is not doucmented behaviour.

Code change checklist

• I have ensured that all methods and functions are fully documented using doxygen style comments.
• My code follows the coding style guide.
• I tested that my change works before raising the PR.
• I have ensured that I did not break any existing API calls.
• I have not built my pull request using AI, a static analysis tool or similar without any human oversight.

[netlify]

✅ Deploy Preview for dpp-dev ready!

Name	Link
🔨 Latest commit	3f2b333
🔍 Latest deploy log	https://app.netlify.com/sites/dpp-dev/deploys/6696e281f9372f00082e9efa
😎 Deploy Preview	https://deploy-preview-1200--dpp-dev.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify site configuration.