Cleanup logic of applying old chunk

[Longarithm]

When there is no chunk at some height, chunk header is just copied from previous block and Chain::get_apply_chunk_job_old_chunk is called.

Inside it, RuntimeAdapter::apply_transactions is called, which may look like that transactions and receipts are applied, but in fact it is not the case after ProtocolFeature::FixApplyChunks. It means that a bunch of fields is not needed, like receipts, transactions, gas_price, block_timestamp, so we can simplify the logic in such case.

The only updates which can happen are Runtime::update_validator_accounts and Runtime::apply_migrations, and they must be preserved. But I suggest to investigate moving them to their own Runtime method, potentially we can remove bunch of code after that.

More context near.zulipchat.com/#narrow/stream/295302-general/topic/.E2.9C.94.20gas.20price.20inconsistency/near/394894144