Do not validate data on retrieval from storage

The invariant we want to rely on is that once data is stored it's always correct - i.e. as long as it can be deserialized then it must be correct according to business rules. It means it's not necessary to perform any data validation after retrieval and before sending.
Inspect Storage component and look for examples that break this rule (and do validate data after retrieval).
Example: https://github.com/casper-network/casper-node/blob/dev/node/src/components/storage.rs#L1481=
If so, make sure data is validated before storing and remove the validation that happens upon retrieval.