fix(lib/contracts): add one block wait for holesky deployments (#2552)

Add 12 second/~1 block wait for Holesky deployments in an effort to
diagnose Staging deployment failures on Holesky.

issue: none

lib/ethclient/ethbackend/backend.go

@@ -12,6 +12,7 @@ import (
 	"github.com/omni-network/omni/lib/anvil"
 	"github.com/omni-network/omni/lib/errors"
 	"github.com/omni-network/omni/lib/ethclient"
+	"github.com/omni-network/omni/lib/evmchain"
 	"github.com/omni-network/omni/lib/fireblocks"
 	"github.com/omni-network/omni/lib/k1util"
 	"github.com/omni-network/omni/lib/log"
@@ -177,6 +178,12 @@ func (b *Backend) WaitMined(ctx context.Context, tx *ethtypes.Transaction) (*eth
 		return rec, errors.New("receipt status unsuccessful", "status", rec.Status, "tx", tx.Hash())
 	}
 
+	// If b.chainID == holesky, wait a little longer for the tx to be indexed.
+	if b.chainID == evmchain.IDHolesky {
+		log.Debug(ctx, "Waiting extra 12 seconds (~1 block) for tx to be indexed on Holesky")
+		time.Sleep(time.Second * 12)
+	}
+
 	return rec, nil
 }