Versioning of UI and grpc-agent for passing version (#324)

Send Desktop UI client version as user-agent to daemon

This is sent on every login request to the management

Parse the GRPC context on the system package and 
retrieves the user-agent

Management receives the new UIVersion field and 
store in the Peer's system meta

client/system/info_test.go

@@ -1,13 +1,26 @@
 package system
 
 import (
+	"context"
 	"testing"
 
 	"github.com/stretchr/testify/assert"
+	"google.golang.org/grpc/metadata"
 )
 
-func Test_LocalVersion(t *testing.T) {
-	got := GetInfo()
+func Test_LocalWTVersion(t *testing.T) {
+	got := GetInfo(context.TODO())
 	want := "development"
 	assert.Equal(t, want, got.WiretrusteeVersion)
 }
+
+func Test_UIVersion(t *testing.T) {
+	ctx := context.Background()
+	want := "netbird-desktop-ui/development"
+	ctx = metadata.NewOutgoingContext(ctx, map[string][]string{
+		"user-agent": {want},
+	})
+
+	got := GetInfo(ctx)
+	assert.Equal(t, want, got.UIVersion)
+}