DNM CI: investigate tests KVM regression

[alicefr]

The systemd 255.4-1ubuntu8.16 update from noble-updates breaks /dev/kvm passthrough into podman containers.
CI:

• Update integration test GitHub Actions workflow to install systemd and related packages at version 255.4-1ubuntu8.15 for reproducible CI runs.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Pins systemd and related libraries to version 255.4-1ubuntu8.15 in the integration test CI workflow to diagnose a KVM passthrough regression introduced by a newer noble-updates release.

File-Level Changes

Change	Details	Files
Pin systemd and related packages to a specific version in CI integration test environment to bisect a KVM passthrough regression.	Extend the apt-get build dependencies install step in the integration-tests GitHub Actions workflow. Add explicit version pin for systemd to 255.4-1ubuntu8.15. Add matching version pins for libsystemd0, libsystemd-shared, libudev1, and udev to 255.4-1ubuntu8.15 to keep the stack consistent.	.github/workflows/integration-tests.yml

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[sourcery-ai]

Hey - I've left some high level feedback:

• Since this is a temporary debugging pin, consider adding an inline comment in the workflow near the package list explaining the KVM regression context and any tracking issue/bug so it’s clear when it can be removed.
• Pinning core packages to an exact version in CI can start failing once that version is removed from the mirror; you may want to add a fallback strategy (e.g., a conditional install or an apt preference file) so the workflow degrades gracefully when 255.4-1ubuntu8.15 is no longer available.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- Since this is a temporary debugging pin, consider adding an inline comment in the workflow near the package list explaining the KVM regression context and any tracking issue/bug so it’s clear when it can be removed.
- Pinning core packages to an exact version in CI can start failing once that version is removed from the mirror; you may want to add a fallback strategy (e.g., a conditional install or an apt preference file) so the workflow degrades gracefully when 255.4-1ubuntu8.15 is no longer available.

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