Feat/Add checkbox for destinations opened filtering

Merged Imane Misrar requested to merge add-filter-available-destinations into dev

Add checkbox to only filter on open destinations

Breaking change: denormalized info shape has changed to recompute it after the rebase :

make shell_backend
./manage.py shell
from backend_app.models.university import update_denormalized_univ_field
Edited by Imane Misrar

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