(request-policy) - Fix requestPolicyExchange usage with persisted caching #1742
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Resolves #1644
Set of changes
Do not set the TTL unless cache outcome is "miss". If the first result to come through the requestPolicyExchange was a cache-hit then the ttl was set initially based on this cache hit and no network request was made. This happens when using
persisted caching with the graphcache exchange since the very first result could be a cache hit.