Backport of client: ignore restart issued to terminal allocations into release/1.3.x #17209
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Backport
This PR is auto-generated from #17175 to be assessed for backporting due to the inclusion of the label backport/1.3.x.
The below text is copied from the body of the original PR.
This PR fixes a bug where issuing a restart to a terminal allocation
would cause the allocation to run its hooks anyway. This was particularly
apparent with group_service_hook who would then register services but
then never deregister them - as the allocation would be effectively in
a "zombie" state where it is prepped to run tasks but never will.
Part of #17079
Part of #16238
Part of #14618
Part of #17182
Part of #16762
Note this doesn't appear to be the only source of leaked registrations - see #17079 for more.