test: v2.3.0 merge (#396) test-compile debt — only vendored libmdbx-rs tests remain

[nekomoto911]

Status (updated): Most of this is fixed in PR #396 (commit bfceb3d7a3).
The only remaining test-compile failures are the 21 in the vendored
crates/storage/libmdbx-rs/tests/ — see Remaining below.

Background

The reth v2.3.0 merge updated library APIs but not the corresponding test code,
breaking CI (test / ethereum, unit, clippy) while main stayed green (e.g.
#395's test / ethereum runs and passes). These were introduced by the merge,
not pre-existing.

Remaining

Failing target	Errors	Root cause
reth-libmdbx (cursor + transaction tests)	21	Transaction::cursor(..) signature drift — tests pass a u32 dbi, the API now takes &Database. In crates/storage/libmdbx-rs/tests/.

libmdbx-rs is treated as vendored (CLAUDE.md: "never modify libmdbx sources"),
though that rule targets the C sources under mdbx-sys/libmdbx/, not the Rust
binding's own tests/. Fixing these is mechanical (update the cursor(dbi) call
sites) but needs a decision on whether the binding tests are in scope to touch.

Until this is resolved, test / ethereum, unit, and clippy stay red (they
compile the libmdbx integration tests). clippy --benches additionally hits an
old-API state_root_task.rs bench, out of the --tests scope.

Fixed in #396 (bfceb3d7a3)

• ethereum feature — re-added the no-op ethereum = [] to bin/reth (it
  was dropped with the deleted reth-bench crate), so
  --features "asm-keccak ethereum config-from-env" resolves again.
• reth-rpc (148) — MockEthProvider now implements PruneCheckpointReader,
  the bound v2.3.0 added to RpcNodeCore; one fixture fix cleared all 148.
• revm40 drift — AccountInfo { .. } now takes account_id;
  SparseTrieErrorKind::BlindedNode is a tuple variant.
• reth-engine-tree (19) + reth-exex (4) — adapted tests to insert_block
  (StorageLocation), spawn (ExecutableTxIterator), OnStateHook::on_state,
  the PayloadValidator split, EngineApiTreeState::new, mpsc-vs-crossbeam
  channels, and #[must_use] on_engine_message.
• reth-evm — removed 4 obsolete balance_increment_state tests (the helper
  was removed in alloy-evm 0.36.0 and is unused by production code).
• e2e-rocksdb — removed the test, the orphaned db/migrate_v2.rs, and the
  e2e-rocksdb CI job (the RocksDB backend was intentionally dropped in the
  merge — "不并存"). If e2e-rocksdb is a required status check, drop it from the
  required list or the PR stays BLOCKED.
• check-toml / typos — dprint-formatted 9 drifted Cargo.tomls; fixed 7 doc
  typos.