Run group creation before migrations instead of a separate script

[Donnype]

Changes

(Changes pushed here as a note before I'll be off the next weeks.)

This PR tries to change the way we seed our permission groups. We now need to run the (badly named since it only seeds the groups now) setup_dev_account to seed these groups. The other way to do this is via a migrations, but there are already older migrations that depend on the existence of the groups. Hence I figured (though I'm open to other options) that the only way to remove this manual step is to run the creation on pre_migrate. I also made the operation idempotent so that it can safely be run several times.

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Code Checklist

• All the commits in this PR are properly PGP-signed and verified.
• This PR only contains functionality relevant to the issue.
• I have written unit tests for the changes or fixes I made.
• I have checked the documentation and made changes where necessary.
• I have performed a self-review of my code and refactored it to the best of my abilities.

• Tickets have been created for newly discovered issues.
• For any non-trivial functionality, I have added integration and/or end-to-end tests.
• I have informed others of any required .env changes files if required and changed the .env-dist accordingly.
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