Merge branch 'preferred-node-id' into node_id_hint_3

Author: asmyasnikov

CHANGELOG.md

@@ -1,4 +1,5 @@
 * Added option to set preferred node id to execute query
+* Set the `pick_first` balancer for short-lived grpc connection inside ydb cluster discovery attempt
 
 ## v3.90.1
 * Small broken change: added method `ID()` into `spans.Span` interface (need to implement in adapter) 

internal/balancer/balancer.go

@@ -202,6 +202,9 @@ func makeDiscoveryFunc(
 			append(
 				driverConfig.GrpcDialOptions(),
 				grpc.WithBlock(),
+				grpc.WithDefaultServiceConfig(`{
+					"loadBalancingPolicy": "pick_first"
+				}`),
 			)...,
 		)
 		if err != nil {