Merge PR stack into eachother bottom to top

[stoopkidddd]

Right now the current functionality is to merge the top most PR and close all PR's below it. This works, however if you have issue trackers like Jira, Linear, etc that are linked to the PR's, it is really confusing to see tickets linked to closed PR's.

It'd be nice if there was an option to reverse the functionality, and merge all the PR's into eachother the way they are defined, with the first one in the stack ending up with all the changes and being merged into the target branch.