* feat(bedrock): getL2Output reverts if not found

feat(bedrock): Handle error on empty output in Portal

feat(ctb): use isOutputFinalized in finalizeWithdrawalTx

* ctb: Remove extraneous abi encoding

Revert "feat(ctb): use isOutputFinalized in finalizeWithdrawalTx"

This reverts commit 4d4e89d4f624b8cbd95c1ad2800027bfe561c213.

ctb: getL2Output returns the next output for a block

ctb: Fix error message style