Add utility to set instance settings in Jest (#27532)

* Add `mockSettings` utility

* Use `mockSettings` in sidebar tests

* Use `mockSettings` in database edit app tests

* Use `mockSettings` in update info form

* Use `mockSettings` in caching utils

* Use `mockSettings` in question cache TTL field

* Use `mockSettings` in new dashboard modal

* Use `mockSettings` in question info sidebar

* Use `mockSettings` in save question modal

* Use `mockSettings` in profile link

* Ensure settings are passed to redux in tests

* Update signature

* Fix test