This adds our first Jammy production server to the mix. We update the
gitea load balancer as it is a fairly simple service which will allow us
to focus on Jammy updates and not various server updates.
We update testing to shift testing to a jammy node as well. We don't
remove gitea-lb01 yet as this will happen after we switch DNS over to
the new server and are happy with it.
Change-Id: I8fb992e23abf9e97756a3cfef996be4c85da9e6f