server/failtracer: don't assume only being fed two-elem calls #7995
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This was overly specific before, and quickly failed when fail events had not been on of the right sort. Now, we're more lenient.
These would happen, as in https://github.com/orgs/open-policy-agent/discussions/722#discussioncomment-14812737, when a fail event happened that's unrelated to unknowns lookup, but a valid failure nonetheless. So this will not lead to a hint. Only fail events of the previously-expected form could yield hints.
Reported by @huntkalio