mock: reduce peer count in FuzzManyPeers when the race detector is enabled

p2p/net/mock/mock_test.go

@@ -586,7 +586,11 @@ func TestLimitedStreams(t *testing.T) {
 	}
 }
 func TestFuzzManyPeers(t *testing.T) {
-	for i := 0; i < 50000; i++ {
+	peerCount := 50000
+	if detectrace.WithRace() {
+		peerCount = 1000
+	}
+	for i := 0; i < peerCount; i++ {
 		_, err := FullMeshConnected(context.Background(), 2)
 		if err != nil {
 			t.Fatal(err)