[Merge] ~enr0n/ubuntu/+source/systemd:ubuntu-lunar-next into ~ubuntu-core-dev/ubuntu/+source/systemd:ubuntu-lunar

[Lukas Märdian]

Review: Approve

Okay, so this is a post feature freeze upload. It only contains a targeted fix for bug #2004478 and also a drive-by fix for the test system, which is part of a bigger PR upstream, which can be dropped after v253 lands in Ubuntu: https://github.com/systemd/systemd/pull/25986

LGTM overall.

But I had some trouble connecting the dots on d/p/sd-netlink-skip-test_rtnl_set_link_name-when-altnames-are.patch (it seemed a bit out of context). So I added some additional DEP3 headers to that patch, to make clear where it comes from and when it can be dropped exactly.
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https://code.launchpad.net/~enr0n/ubuntu/+source/systemd/+git/systemd/+merge/438554
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