Backport of client: always run alloc cleanup hooks on final update into release/1.4.x #15924
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Backport
This PR is auto-generated from #15855 to be assessed for backporting due to the inclusion of the label backport/1.4.x.
The below text is copied from the body of the original PR.
This PR fixes a bug where alloc pre-kill hooks were not run in the
edge case where there are no live tasks remaining, but it is also
the final update to process for the (terminal) allocation. We need
to run cleanup hooks here, otherwise they will not run until the
allocation gets garbage collected (i.e. via Destroy()), possibly
at a distant time in the future.
Fixes #15477