Backport of CSI: plugin supervisor prestart should not mark itself done into release/1.2.x

[hc-github-team-nomad-core]

Backport

This PR is auto-generated from #12752 to be assessed for backporting due to the inclusion of the label backport/1.2.x.

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

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Fixes #12744

The task runner hook Prestart response object includes a Done
field that's intended to tell the client not to run the hook
again. The plugin supervisor creates mount points for the task during
prestart and saves these mounts in the hook resources. But if a client
restarts the hook resources will not be populated. If the plugin task
restarts at any time after the client restarts, it will fail to have
the correct mounts and crash loop until restart attempts run out.

Fix this by not returning Done in the response, just as we do for
the volume_mount_hook.

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