Backport of make eval cancelation async with Eval.Ack
into release/1.4.x
#15297
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Backport
This PR is auto-generated from #15294 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.
In #14621 we added an eval canelation reaper goroutine with a channel that allowed us to wake it up. But we forgot to actually send on this channel from
Eval.Ack
and are still committing the cancelations synchronously. Fix this by sending on the buffered channel to wake up the reaper instead.(ref https://github.com/hashicorp/nomad/pull/14621/files#r1025630828)