github/workflows: add support for testing different cgroup setups

github/workflows: add support for testing different cgroup setups

Add support to run the Github workflow on three parallel runners, each
of them have a unique cgroup setup:
cgroup v1 only (legacy), cgroup v1/v2 (hybrid), cgroup v2 only (unified).

With this change, we should be able to run every patch against all
combination of cgroup setups.

Suggested-by: Tom Hromatka <tom.hromatka@oracle.com>
Signed-off-by: Kamalesh Babulal <kamalesh.babulal@oracle.com>
Signed-off-by: Tom Hromatka <tom.hromatka@oracle.com>
TJH: Remove the clean logic and instead use the Github Actions
	$ACTIONS_RUNNER_HOOK_JOB_STARTED environment variable