rtla/tests: Add runtime tests for -C/--cgroup

Add a new script check-cgroup-match.sh that retrieves the cgroup of the
main rtla process and compares it to the cgroup of the rtla workload
threads.

Add a new test based on this script, for both osnoise and timerlat
tools, testing the variant of -C without argument (which sets the cgroup
of the workload to the cgroup of the rtla main process).

Note that this has to be tested in kernel mode to be significant for
timerlat tool, as user workloads inherit the parent rtla process cgroup
even without the option.

Reviewed-by: Wander Lairson Costa <wander@redhat.com>
Link: https://lore.kernel.org/r/20260423130558.882022-10-tglozar@redhat.com
Signed-off-by: Tomas Glozar <tglozar@redhat.com>

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