fix: CI failures - EVM tests and metadata artifacts

- tests-evm.yml: use pezkuwichain/revive-differential-tests fork with
  pez-revive-dev-node platform aliases
- .gitignore: allow vendor/pezkuwi-subxt/artifacts/ to be tracked
- Add metadata .scale files for compile-time macro expansion
- Rename polkadot_metadata_* references to pezkuwi_metadata_*

vendor/pezkuwi-subxt/subxt/examples/setup_client_offline.rs

@@ -21,7 +21,7 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
 	// 3. Metadata (I'll load it from the downloaded metadata, but you can use `subxt metadata >
 	//    file.scale` to download it):
 	let metadata = {
-		let bytes = std::fs::read("./artifacts/polkadot_metadata_small.scale").unwrap();
+		let bytes = std::fs::read("./artifacts/pezkuwi_metadata_small.scale").unwrap();
 		Metadata::decode(&mut &*bytes).unwrap()
 	};