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

jira NONE_AUTOMATION
Rebuild_History Non-Buildable kernel-5.14.0-570.17.1.el9_6
commit-author Waiman Long <[email protected]>
commit 65046b5

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 <[email protected]>
	Signed-off-by: Tejun Heo <[email protected]>
(cherry picked from commit 65046b5)
	Signed-off-by: Jonathan Maple <[email protected]>

Author: PlaidCat