[Admin Analytics] fix user stats avg dau typecasting
Created by: thenamankumar
Type conversion issue with large numbers on admin analytics users stats page, particularly the avg DAU/WAU/MAU chart. The default type for avg is float in SQL query response, but when a large number is converted to int32 in golang, it gives a syntax error.
Typecasting the avgs to int in SQL to fix it.
Test plan
Check diff.