substrate-node: `NativeElseWasmExecutor` is no longer used (#2521)
This PR removes `NativeElseWasmExecutor` usage from substrate node. Instead [`WasmExecutor<(sp_io::SubstrateHostFunctions, sp_statement_store::runtime_api::HostFunctions)>`](https://github.com/paritytech/polkadot-sdk/blob/49a41ab3bb3f630c20e5b24cec8d92382404631c/substrate/bin/node/executor/src/lib.rs#L26 ) is used. Related to #2358. --------- Co-authored-by: Davide Galassi <[email protected]>