Release v2.15.0

What's Changed

• 📦 Update model and publicodes (#878)
• 🩹 re link custom questions and answers (#879)
• 🐛 Add redirection to end page, one last save when reaching the end (#862)
• 💬 Update text in stats page (#896)
• 👷 deploy on scalingo (NGC-1656) #880
• 🩹 next image requests #898
• 🧪 Add automatic A11Y testing and enrich E2E tests (organisations, actions) [NGC-1657, NGC-1750] (#864)
• Upgrade model version (NGC-1765) (#885)
• ♻️ Update resource link (#901)
• 💩 Add temporary code to avoid breaking poll results page for polls with 1000+ participations (#905)

Full Changelog: v2.14.0...v2.15.0