test: use a more direct form of interruption in fncache "recover" testing
The previous test was relying on implementation details and harder to maintain. The new version is closer to the initial intend : "What happens if the process die without cleanup". This change is motivated by further changes around the transaction and dirstate logic that would break the fragile equilibrium that existed before this patch. Making this change early make it easier to review on its own and remove noise in future larger changes.
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