Better handling of stable-only build (#6569)

* Better handling of stable-only build

* Fix node template build

* Fix wasm builder node-template version mismatch

* Fix load_spec error

* Add , in parameter

* Add descrptive panic messages in tests

* Add descriptive tests in node/executor benches

* Fix missing compact_code_unwrap

* Add missing wasm_binary_unwrap function for executor integration test

* Only define import_sp_io in no_std

* Small Cargo.toml styling fix

* Bump wasm-builder to 2.0.0

* Fix all `with_wasm_builder_from_crates` version in Substrate

* Use `with_wasm_builder_from_crates` for node-template

Co-authored-by: Gavin Wood <gavin@parity.io>

substrate/client/executor/src/lib.rs

@@ -65,7 +65,7 @@ pub trait RuntimeInfo {
 #[cfg(test)]
 mod tests {
 	use super::*;
-	use sc_runtime_test::WASM_BINARY;
+	use sc_runtime_test::wasm_binary_unwrap;
 	use sp_io::TestExternalities;
 	use sp_wasm_interface::HostFunctions;
 	use sp_core::traits::CallInWasm;
@@ -82,7 +82,7 @@ mod tests {
 			8,
 		);
 		let res = executor.call_in_wasm(
-			&WASM_BINARY[..],
+			&wasm_binary_unwrap()[..],
 			None,
 			"test_empty_return",
 			&[],