fix: add wrpc dependency cloning step in CI workflow and remove obsolete .rustfmt.toml

Author: jmagan

.github/workflows/build.yml

@@ -20,6 +20,9 @@ jobs:
       - run: cargo clippy
       - run: cargo fmt --check
       # Mock ledger
+      - name: Mock Ledger - Clone wrpc dependency
+        run: git clone https://github.com/bytecodealliance/wrpc.git
+        working-directory: ../
       - name: Mock Ledger - Check formatting
         run: cargo fmt --check
         working-directory: mock-ledger/backend