Backport of client: cleanup empty task directory when using unveil filesystem isolation into release/1.8.x #23239
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Backport
This PR is auto-generated from #23237 to be assessed for backporting due to the inclusion of the label backport/1.8.x.
The below text is copied from the body of the original PR.
This PR fixes a bug where Nomad client would leave behind an empty directory
created on behalf of tasks making use of the unveil filesystem isolation
mode (i.e. using exec2 task driver). Once unmounting is complete, we should
remember to also delete the directory.
Fixes #22433
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