Modify user agent format with subsystem and is proxy configured information (#3116)

github/actions/user_agent_test.go

@@ -0,0 +1,24 @@
+package actions_test
+
+import (
+	"testing"
+
+	"github.com/actions/actions-runner-controller/github/actions"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestUserAgentInfoString(t *testing.T) {
+	userAgentInfo := actions.UserAgentInfo{
+		Version:    "0.1.0",
+		CommitSHA:  "1234567890abcdef",
+		ScaleSetID: 10,
+		HasProxy:   true,
+		Subsystem:  "test",
+	}
+
+	userAgent := userAgentInfo.String()
+	expectedProduct := "actions-runner-controller/0.1.0 (1234567890abcdef; test)"
+	assert.Contains(t, userAgent, expectedProduct)
+	expectedScaleSet := "ScaleSetID/10 (Proxy/enabled)"
+	assert.Contains(t, userAgent, expectedScaleSet)
+}