AYS-555 | Refactored "ALREADY EXIST" errors to standardize as "CONFLICT ERROR"

[gunesakkayaa]

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[agitrubard]

Selamlar @gunesakkayaa,

• Pull requestin başlığını var olan standartlarımıza göre güncellememiz gerekiyor. Detaylar checklist'te yazıyor.
• Bu branch için önemli değil ama bir sonrakiler için issue'nun tipine göre branch'teki prefix'i belirleyebilirsek çok daha iyi olabilir. Yani biz şu an bugfix değil refactor yaptık ✅
• Reviewer kısmına @afet-yonetim-sistemi/back-end ve @afetyonetimsistemi hesaplarını eklememeye çalışalım. Sadece kişileri eklesek yeterli ✅