DEV: Add Flarum to Discourse Import Script (PR #13139)

PR to push basic Flarum Import script to main


CLA assistant check
Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
You have signed the CLA already but the status is still pending? Let us recheck it.

The title of this pull request changed from “Add files via upload” to "DEV: Add Flarum to Discourse Import Script

Thanks for the script!

I just saw that linting is failing. Can you fix those failures please?