Wallet maintainer: Resolve deposit script type at the very end (#3719)

The script type resolution requires access to transaction data stored on
the Bitcoin blockchain. If the given transaction hasn't actually
happened but was revealed as deposit to the `Bridge`, the maintainer
will not be able to resolve the deposit script type. So far, an error
was returned in that case and the maintainer stopped the entire deposit
sweep task. This cannot happen as the maintainer can be blocked on
deposit sweeps for a long time. Instead, the maintainer should log an
error and leave the deposit type unresolved.

pkg/maintainer/wallet/deposit_sweep.go

@@ -117,19 +117,6 @@ func FindDeposits(
 
 		logger.Debugf("getting details of deposit %d/%d", i+1, len(depositRevealedEvents))
 
-		depositTransaction, err := btcChain.GetTransaction(
-			event.FundingTxHash,
-		)
-		if err != nil {
-			return result, fmt.Errorf(
-				"failed to get deposit transaction: [%w]",
-				err,
-			)
-		}
-
-		publicKeyScript := depositTransaction.Outputs[event.FundingOutputIndex].PublicKeyScript
-		scriptType := bitcoin.GetScriptType(publicKeyScript)
-
 		depositKey := chain.BuildDepositKey(event.FundingTxHash, event.FundingOutputIndex)
 
 		depositRequest, found, err := chain.GetDepositRequest(
@@ -172,6 +159,20 @@ func FindDeposits(
 			continue
 		}
 
+		var scriptType bitcoin.ScriptType
+		depositTransaction, err := btcChain.GetTransaction(
+			event.FundingTxHash,
+		)
+		if err != nil {
+			logger.Errorf(
+				"failed to get deposit transaction data: [%v]",
+				err,
+			)
+		} else {
+			publicKeyScript := depositTransaction.Outputs[event.FundingOutputIndex].PublicKeyScript
+			scriptType = bitcoin.GetScriptType(publicKeyScript)
+		}
+
 		result = append(
 			result,
 			&Deposit{
@@ -229,7 +230,7 @@ func FindDepositsToSweep(
 			return nil,
 				fmt.Errorf(
 					"failed to get deposits for [%s] wallet: [%w]",
-					walletToSweep,
+					hexutils.Encode(walletToSweep[:]),
 					err,
 				)
 		}