Successful merge integration changes status of cherry-picks if changes-ids match

This is a corner case, but still a bug

1. Make changes on 5.x branch and get them merged.
2. Make cherry-picks of the previous changes on 5.x.y branch
3. Merge 5.x branch into 5.x.y

• => When the merge change gets integrated, also the status of the cherry-picks is updated to merged. The git is ok, but Gerrit is in strange state. The patches of original changes got added to the cherry-picks.

Here is the real-life case: https://codereview.qt-project.org/c/qt/tqtc-qt5/+/282152

(Status of the changes was later changed manually to abandoned)