[Task] - let's add forums enable/disable option in Challenge window too.

 FYI : This is feature is reference from  here https://github.com/topcoder-platform/work-manager/issues/1244 

**Challenge Edit window** 

![image](https://user-images.githubusercontent.com/25297859/136219843-4d052f41-7484-405c-8e93-cb18cc2eeb3d.png)

cc @Oanh-and-only-Oanh @vikasrohit 