feat: add email sending for outdated structures

Pour tester :

• Changer la durée du CRON a une minute
• Changer la durée des structures filtrée ( passer de 6 a 2 mois)

added 1 commit

• 0d2666fd - fix: outdated structure range

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unmarked as a Work In Progress

merged

mentioned in commit 4b4a8dc9