tests: run all py tests with cgroupfs and systemd

[kolyshkin]

Many python tests do not run with systemd, and it makes sense to do so.

Summary by Sourcery

Iterate over both cgroupfs and systemd managers when running all Python tests and propagate CGROUP_MANAGER into test utilities to support both cgroup backends.

New Features:

• Detect and include systemd cgroup manager in test runs when available
• Run each test under both cgroupfs and systemd, generating separate logs and TRS files

Enhancements:

• Default cgroup_manager in run_and_get_output to the CGROUP_MANAGER environment variable when not explicitly provided

[sourcery-ai[bot]]

Reviewer's Guide

Tests now run under both cgroupfs and systemd when available, with the cgroup manager propagated from environment into the test utility for consistent behavior.

File-Level Changes

Change	Details	Files
Run Python tests under both cgroupfs and systemd in CI script	Detect if systemd is supported by the runtime Loop over 'cgroupfs' and 'systemd' for test execution Export CGROUP_MANAGER per iteration Suffix log and TRS filenames with manager name	tests/run_all_tests.sh
Allow tests_utils to pick cgroup manager from environment when not explicitly passed	Change default cgroup_manager parameter to None If None, read CGROUP_MANAGER env var or fallback to 'cgroupfs' Pass selected cgroup_manager to crun invocation	tests/tests_utils.py

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[giuseppe]

I'll merge once you are fine with it (no Draft)

[kolyshkin]

This is a draft because I'm not quite sure how the tests are actually run and whether this script is used (if not, we need to supply different value of CGROUP_MANAGER env var, this can probably be done via Makefile).