Backport of CSI: set plugin socket path on restore into release/1.2.x

[hc-github-team-nomad-core]

Backport

This PR is auto-generated from #12149 to be assessed for backporting due to the inclusion of the label backport/1.2.x.

WARNING automatic cherry-pick of commits failed. Commits will require human attention.

The below text is copied from the body of the original PR.

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The Prestart hook for task runner hooks doesn't get called when we
restore a task, because the task is already running. The Postrun hook
for CSI plugin supervisors needs the socket path to have been
populated so that the client has a valid path.

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This got missed in testing #12078, I suspect because I was testing a lot with node plugins running as system jobs which quickly get replaced if you're not paying close attention. In any case, that PR hasn't shipped in a release yet, so there's no changelog. It'll need to be backported with that changeset.

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[lgfa29]

Manually backported

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