Fixed has_attended filter: Filtering users will occur on the backend.…

[yazanzarka1]

… Fixes an issue where some participants won't show up because of pagination.

Description

closes #1100

Changes: Filtrering av deltagerne som ikke har møtt opp, foregår på backend i motsetning til tidligere.

Screenshots:

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Name	Status	Preview	Comments	Updated (UTC)
kvark	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Sep 23, 2024 7:41pm