bugfix: mobilecoind should return a grpc NOT_FOUND error code when ledger data is not found

[eranrund]

Previously, mobilecoind returned a GRPC INVALID_ARGUMENT error when certain calls were made to the ledger database and the data requested wasn't found.
NOT_FOUND is a more correct error code in such cases, and is required for correct behavior of the new remote-mobilecoind fog BlockProvider (see https://github.com/mobilecoinfoundation/mobilecoin/blob/feature/bugfix-ledger-notfound-err-code/fog/block_provider/src/error.rs#L38-L39 and https://github.com/mobilecoinfoundation/mobilecoin/blob/feature/bugfix-ledger-notfound-err-code/fog/ledger/server/src/merkle_proof_service.rs#L156)

To verify this results in the expected behavior I hacked together a client that calls get_outputs on the fog merkleproof service. Prior to this change, I got this result:

Rpc(RpcFailure(RpcStatus { code: 13-INTERNAL, message: "Database Error: GRPC: RpcFailure: 3-INVALID_ARGUMENT get_tx_out_by_index: Record not found", details: [], debug_error_string: "UNKNOWN:Error received from peer  {created_time:\"2023-12-11T11:44:49.535884-08:00\", grpc_status:13, grpc_message:\"Database Error: GRPC: RpcFailure: 3-INVALID_ARGUMENT get_tx_out_by_index: Record not found\"}" }))

And after the change:

GetOutputsResponse { results: [OutputResult { index: 505555455555555555, result_code: 1, output: TxOut { masked_amount: None, target_key: CompressedRistrettoPublic(0000000000000000000000000000000000000000000000000000000000000000), public_key: CompressedRistrettoPublic(0000000000000000000000000000000000000000000000000000000000000000), e_fog_hint: EncryptedFogHint(000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000), e_memo: None }, proof: TxOutMembershipProof { index: 0, highest_index: 0, elements: [] } }], num_blocks: 6030, global_txo_count: 138904, latest_block_version: 3, max_block_version: 3 }

Note that result_code 1 is NotFound (https://github.com/mobilecoinfoundation/mobilecoin/blob/feature/bugfix-ledger-notfound-err-code/fog/api/proto/ledger.proto#L173)

[nick-mobilecoin]

The parse_transfer_code_impl() seems like the mapping might be in the wrong place, not sure if it's necessary for the immediate need.