Fix push notifications where channel is set to all activity (#5594)

* Fix push notifications where channel is set to all activity

* feedback review

* moved push notification logic to DoesStatusAllowPushNotification

* Have every option handled in ShouldSendPushNotification

* unit tests

app/status.go

@@ -235,21 +235,3 @@ func GetStatus(userId string) (*model.Status, *model.AppError) {
 func IsUserAway(lastActivityAt int64) bool {
 	return model.GetMillis()-lastActivityAt >= *utils.Cfg.TeamSettings.UserStatusAwayTimeout*1000
 }
-
-func DoesStatusAllowPushNotification(user *model.User, status *model.Status, channelId string) bool {
-	props := user.NotifyProps
-
-	if props["push"] == "none" {
-		return false
-	}
-
-	if pushStatus, ok := props["push_status"]; (pushStatus == model.STATUS_ONLINE || !ok) && (status.ActiveChannel != channelId || model.GetMillis()-status.LastActivityAt > model.STATUS_CHANNEL_TIMEOUT) {
-		return true
-	} else if pushStatus == model.STATUS_AWAY && (status.Status == model.STATUS_AWAY || status.Status == model.STATUS_OFFLINE) {
-		return true
-	} else if pushStatus == model.STATUS_OFFLINE && status.Status == model.STATUS_OFFLINE {
-		return true
-	}
-
-	return false
-}