Migrated event collection to ODM

[Nydauron]

To be merged into staging feature branch feat/beanie-odm/master

Description

Migrates over event collection references to use Beanie ODM

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[Nydauron]

I assume that this was supposed to be event_not_in_list and not potential_role given the comment below it was:

# If no event in list and no role exists on server

Otherwise, there would be no way for partially deleted events (i.e. events that were deleted from the db but had their roles available) to be fully deleted.