Backport of drivers: move executor process out of v1 task cgroup after process starts into release/1.9.x #24386
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Backport
This PR is auto-generated from #24340 to be assessed for backporting due to the inclusion of the label backport/1.9.x.
The below text is copied from the body of the original PR.
This PR changes the behavior of the raw exec task driver on old cgroups v1
systems such that the executor process is no longer a member of the cgroups
created for the task. Now, the executor process is placed into those
cgroups and starts the task child process (just as before), but now then
exits those cgroups and exists in the nomad parent cgroup. This change
makes the behavior sort of similar to cgroups v2 systems, where we never
have the executor enter the task cgroup to begin with (because we can
directly clone(3) the task process into it).
Fixes #23951
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