MM-48614: saves priority for drafts (#21752)

* MM-48614: saves priority for drafts

Adds a new column in the drafts table, "priority".
This way we can save post's priority in the draft.

Fixes OmitConnectionId, which when you published a ws event for a user
was getting bypassed.

Fixes Get for drafts returns deleted ones as well, which is needed for
upsert.

* Adds test case for the OmitConnectionId

* Addresses review comments, removes DeleteAt

* Vets

* Adds missing translation

* Re-instates DeleteAt column

* Adds separate case to get draft including deleted

* Fixes Update Draft

* Empty

app/platform/web_conn.go

@@ -753,15 +753,15 @@ func (wc *WebConn) ShouldSendEvent(msg *model.WebSocketEvent) bool {
 		return wc.GetConnectionID() == msg.GetBroadcast().ConnectionId
 	}
 
+	if wc.GetConnectionID() == msg.GetBroadcast().OmitConnectionId {
+		return false
+	}
+
 	// If the event is destined to a specific user
 	if msg.GetBroadcast().UserId != "" {
 		return wc.UserId == msg.GetBroadcast().UserId
 	}
 
-	if wc.GetConnectionID() == msg.GetBroadcast().OmitConnectionId {
-		return false
-	}
-
 	// if the user is omitted don't send the message
 	if len(msg.GetBroadcast().OmitUsers) > 0 {
 		if _, ok := msg.GetBroadcast().OmitUsers[wc.UserId]; ok {