[MM-8497] Ability to set Do Not Disturb for a specified period of time (#17680)

* Revert "Revert "[MM-8497] Ability to set Do Not Disturb for a specified period of time (#16067)" (#17657)"

This reverts commit ff383990f8.

* add debug log for recurring function

* add feature flag for dnd timed status

* refactoring changes

Co-authored-by: Mattermod <mattermod@users.noreply.github.com>

app/app.go

@@ -575,3 +575,7 @@ func (a *App) CheckIntegrity() <-chan model.IntegrityCheckResult {
 func (a *App) SetServer(srv *Server) {
 	a.srv = srv
 }
+
+func (a *App) UpdateExpiredDNDStatuses() ([]*model.Status, error) {
+	return a.Srv().Store.Status().UpdateExpiredDNDStatuses()
+}