I mention product managers (accounts with that status on launchpad) can kick off ISO builds; that of course has its limits; ie. the Ubuntu Release Team have most control; but product managers can only kick off builds for unreleased products that aren't frozen, so resolute or what will be 26.04, or actually a new ISO for noble (as 24.04.5 hasn't been released yet; that right will disappear once that ISO has been frozen/released for all but Ubuntu Release team)... so powers do have limits. (Probably obvious anyway)
If interested in how the ISOs are controlled; it's via seed files I've written about many times here & elsewhere anyway; eg.
with all seed files found at https://ubuntu-archive-team.ubuntu.com/seeds/
As all releases/seeds can be found there; we can contrast changes between flavors, releases and more... I still tend to find the manifest files more useful for my own needs, but where a manifest tells me what's on an ISO, the seed file(s) tells me why it's there.