* op-node: Fix OPB-10

Fixes OPB-10: No Checks for Deposit Transaction Type When Calling `L1InfoDepositTxData()`. This PR adds a check in `blockToBatch` that checks the type of the first transaction in the block, and returns an error if it isn't a deposit transaction.

* goimports
Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>