Log distinct operators participating in DKG

This information is often relevant during DKG debugging. It is good
to have it visible out of the box

(cherry picked from commit 980c85e)

Author: lukasz-zimnoch

pkg/tbtc/dkg.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"errors"
 	"fmt"
+	"golang.org/x/exp/maps"
 	"math/big"
 	"sort"
 
@@ -181,10 +182,15 @@ func (de *dkgExecutor) checkEligibility(
 	}
 
 	dkgLogger.Infof(
-		"selected group members for DKG = %s",
+		"selected group members (seats) for DKG: [%s]",
 		groupSelectionResult.OperatorsAddresses,
 	)
 
+	dkgLogger.Infof(
+		"distinct operators participating in DKG: [%s]",
+		maps.Keys(groupSelectionResult.OperatorsAddresses.Set()),
+	)
+
 	if len(groupSelectionResult.OperatorsAddresses) > de.groupParameters.GroupSize {
 		return nil, nil, fmt.Errorf(
 			"group size larger than supported: [%v]",