list_eom_stale_branches.sh does not work for antelope, where the branch
name has the new style (stable/2023.1) as it tries to search for
stable/antelope, which is wrong. This patch fixes this issue to use
the new stable/<release-id> style.
Change-Id: I6bac959e6346f333c07c31d15c19e6ed54e324b5