autotuning: Append a Status payload to the autotuning cache miss error. #18173
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autotuning: Append a Status payload to the autotuning cache miss error.
Doing so allows detecting this case from callers that might be out-of-process
to signal them to recompute the autotune DB. The other callers of Autotune() don't
mess with the returned Status, so we don't need to modify them directly.
The value is empty right now, as we don't have a need to actually examine it,
but if one is needed it should be a serialized proto.