Use the forget function to leave a room everywhere

Use the forget function to leave a room everywhere this is both for consistency and to reduce dependencies. This way no dependency on RoomManager is required to leave a room and since in all cases they have an object they can just call the function.

src/libneochat/neochatconnection.cpp

@@ -9,6 +9,7 @@
 #include "neochatroom.h"
 #include "spacehierarchycache.h"
 
+#include <Quotient/connection.h>
 #include <Quotient/jobs/basejob.h>
 #include <Quotient/quotient_common.h>
 #include <qt6keychain/keychain.h>
@@ -386,6 +387,13 @@ void NeoChatConnection::createSpace(const QString &name, const QString &topic, c
     });
 }
 
+Quotient::ForgetRoomJob *NeoChatConnection::forgetRoom(const QString &id)
+{
+    Q_EMIT roomAboutToBeLeft(id);
+
+    return Connection::forgetRoom(id);
+}
+
 bool NeoChatConnection::directChatExists(Quotient::User *user)
 {
     return directChats().contains(user);