pub(crate) fn load_pending_batch(mut self, pending_batch: PendingBatchData) -> Self {
        self.pending_batch = Some(pending_batch);
        self
    }
Adds a pending batch data that would be fed into the state keeper.
Note that during processing pending batch, state keeper do *not* call `seal_l2_block` method on the IO (since
it only recovers the temporary state).
core/node/state_keeper/src/testonly/test_batch_executor.rs