Fix replying and editing from chatbox

Restore the functionality to edit or reply to the last message in the `chatbar`.

This is achieved be moving the functions `getLastLocalUserMessageEventId` and `getLatestMessageFromRow` to `NeoChatRoom` as `editLastMessage` and `replyLastMessage` as `chatbar` no longer has access to `messageEventModel`.

The functions are also simplified as they only need to find the `eventId` and always from row 0 as this was the only use of the functions.

BUG: 469733

src/neochatroom.h

@@ -3,6 +3,7 @@
 
 #pragma once
 
+#include <qobjectdefs.h>
 #include <room.h>
 
 #include <QCache>
@@ -735,6 +736,20 @@ public:
      */
     void setSavedText(const QString &savedText);
 
+    /**
+     * @brief Reply to the last message sent in the timeline.
+     *
+     * @note This checks a maximum of the previous 35 message for performance reasons.
+     */
+    Q_INVOKABLE void replyLastMessage();
+
+    /**
+     * @brief Edit the last message sent by the local user.
+     *
+     * @note This checks a maximum of the previous 35 message for performance reasons.
+     */
+    Q_INVOKABLE void editLastMessage();
+
 #ifdef QUOTIENT_07
     /**
      * @brief Get a PollHandler object for the given event Id.