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_*

.github/workflows/tests-evm.yml

@@ -52,8 +52,8 @@ jobs:
       - name: Checkout the Differential Tests Repository
         uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
         with:
-          repository: paritytech/revive-differential-tests
-          ref: a6e4932a08b1ca231e4a02ca6e54e08a53f0e786
+          repository: pezkuwichain/revive-differential-tests
+          ref: fd6b707
           path: revive-differential-tests
           submodules: recursive
       - name: Installing Retester