chore: Migrate /superset/user_slices and /superset/fave_slices to API v1 (#22964)

Co-authored-by: hughhhh <hughmil3s@gmail.com>

superset/models/slice.py

@@ -332,6 +332,12 @@ class Slice(  # pylint: disable=too-many-public-methods
         name = escape(self.chart)
         return Markup(f'<a href="{self.url}">{name}</a>')
 
+    @property
+    def created_by_url(self) -> str:
+        if not self.created_by:
+            return ""
+        return f"/superset/profile/{self.created_by.username}"
+
     @property
     def changed_by_url(self) -> str:
         return f"/superset/profile/{self.changed_by.username}"  # type: ignore