selftest/cgroup: Update test_cpuset_prs.sh to use | as effective CPUs and state separator

JIRA: https://issues.redhat.com/browse/RHEL-83455

commit 65046b5
Author: Waiman Long <longman@redhat.com>
Date:   Sun, 30 Mar 2025 17:52:46 -0400

    selftest/cgroup: Update test_cpuset_prs.sh to use | as effective CPUs and state separator

    Currently, ',' is used as the cgroup separator of the expected effective
    CPUs and partition root states in the test matrix. However, ',' can be
    part of the output of the cpuset.cpus*.effective and cpuset.cpus.isolated
    files. Change the separator to '|' so that ',' can appear as part of
    the expected values.

    Signed-off-by: Waiman Long <longman@redhat.com>
    Signed-off-by: Tejun Heo <tj@kernel.org>

Signed-off-by: Waiman Long <longman@redhat.com>

Author: Waiman-Long