[#6] services/object: Simplify local/remote targets

We do not use the return result from Close() and we always execute both
methods in succession. It makes sense to unite them.

Signed-off-by: Evgenii Stratonikov <e.stratonikov@yadro.com>

pkg/services/object/put/distributed.go

@@ -18,8 +18,7 @@ import (
 )
 
 type preparedObjectTarget interface {
-	WriteObject(*objectSDK.Object, object.ContentMeta) error
-	Close(ctx context.Context) (*transformer.AccessIdentifiers, error)
+	WriteObject(context.Context, *objectSDK.Object, object.ContentMeta) error
 }
 
 type distributedTarget struct {
@@ -170,10 +169,9 @@ func (t *distributedTarget) sendObject(ctx context.Context, node nodeDesc) error
 
 	target := t.nodeTargetInitializer(node)
 
-	if err := target.WriteObject(t.obj, t.objMeta); err != nil {
+	err := target.WriteObject(ctx, t.obj, t.objMeta)
+	if err != nil {
 		return fmt.Errorf("could not write header: %w", err)
-	} else if _, err := target.Close(ctx); err != nil {
-		return fmt.Errorf("could not close object stream: %w", err)
 	}
 	return nil
 }