* feat: adds ability to disable posting in discussions indefinitely
* test: fixed ffailing test cases
* test: added new model field in test cases
* refactor: removes unnecessary migrations
* refactor: removed previous migrations and adds new field in discussions api
* refactor: added docstring and changed method name
---------
Co-authored-by: ayesha waris <73840786+ayeshoali@users.noreply.github.com>