[Merge] ~enr0n/ubuntu/+source/systemd:ubuntu-kinetic-merge-251.2-2 into ~ubuntu-core-dev/ubuntu/+source/systemd:ubuntu-kinetic

[Nick Rosbrook]

After further testing, it seems it was unnecessary to denylist TEST-29-PORTABLE again (must have been a flaky run), so I have dropped that patch.

I believe I addressed all other comments as requested.
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https://code.launchpad.net/~enr0n/ubuntu/+source/systemd/+git/systemd/+merge/425171
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