Remove visibility of POI in app before cut-off date

[nscharioth]

As an app user, I no longer want to see the POI (doors, posters, flyers) associated with the 2025 federal elections. As a cut-off date 15 March 2025 (POI timestamp) is proposed

Acceptance criteria:

• Remove visibility of all doors entered by users before 15 March 2025
• Remove visibility of all posters entered by users before 15 March 2025
• Remove visibility of all flyers entered by users before 15 March 2025
• Remove visibility not just on the map, but also lists (e.g. 'My posters')
• POI should NOT be deleted from the database (visibility management only)
• Statistics should reflect all POI before 15 March 2025 (and not thereafter)
• Badges won by users should reflect all POI entered before 15 March 2025 (and not thereafter)

Outlook:

• implement a campaign layer concept Show map elements depending on currently active campaign layer #633

[nscharioth]

Please review and place in 'ready for development'. @leagerndt @JuliaFreitagBGSt @iantrieschmann