[full-ci] enhancement: use reva client pool selectors (#6452)

* enhancement: use reva client pool selectors

register mock service to registry and pass tests

* enhancement: bump reva

* Fix a couple of linter issues

---------

Co-authored-by: Ralf Haferkamp <rhaferkamp@owncloud.com>

services/thumbnails/pkg/server/grpc/server.go

@@ -2,6 +2,7 @@ package grpc
 
 import (
 	"github.com/cs3org/reva/v2/pkg/rgrpc/todo/pool"
+	"github.com/owncloud/ocis/v2/ocis-pkg/registry"
 	"github.com/owncloud/ocis/v2/ocis-pkg/service/grpc"
 	"github.com/owncloud/ocis/v2/ocis-pkg/version"
 	thumbnailssvc "github.com/owncloud/ocis/v2/protogen/gen/ocis/services/thumbnails/v0"
@@ -41,12 +42,14 @@ func NewService(opts ...Option) grpc.Service {
 		options.Logger.Error().Err(err).Msg("could not get gateway client tls mode")
 		return grpc.Service{}
 	}
-	gc, err := pool.GetGatewayServiceClient(tconf.RevaGateway,
+
+	gatewaySelector, err := pool.GatewaySelector(tconf.RevaGateway,
 		pool.WithTLSCACert(options.Config.GRPCClientTLS.CACert),
 		pool.WithTLSMode(tm),
+		pool.WithRegistry(registry.GetRegistry()),
 	)
 	if err != nil {
-		options.Logger.Error().Err(err).Msg("could not get gateway client")
+		options.Logger.Error().Err(err).Msg("could not get gateway selector")
 		return grpc.Service{}
 	}
 	var thumbnail decorators.DecoratedService
@@ -61,8 +64,8 @@ func NewService(opts ...Option) grpc.Service {
 					options.Logger,
 				),
 			),
-			svc.CS3Source(imgsource.NewCS3Source(tconf, gc)),
-			svc.CS3Client(gc),
+			svc.CS3Source(imgsource.NewCS3Source(tconf, gatewaySelector)),
+			svc.GatewaySelector(gatewaySelector),
 		)
 		thumbnail = decorators.NewInstrument(thumbnail, options.Metrics)
 		thumbnail = decorators.NewLogging(thumbnail, options.Logger)