✨(models) add slug field to Team model

Add slug field for team objects. Unique slug based on team names,
in an effort to avoid duplicates.

src/backend/core/admin.py

@@ -108,4 +108,5 @@ class TeamAdmin(admin.ModelAdmin):
         "created_at",
         "updated_at",
     )
+    prepopulated_fields = {"slug": ("name",)}
     search_fields = ("name",)