Backport of variables: limit rekey eval to half the nack timeout into release/1.4.x #15103
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Backport
This PR is auto-generated from #15102 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 order to limit how much the rekey job can monopolize a scheduler worker, we limit how long it can run to 1min before stopping work and emitting a new eval. But this exactly matches the default nack timeout, so it'll fail the eval rather than getting a chance to emit a new one.
Set the timeout for the rekey eval to half the configured nack timeout.