fix: add test helper file

Signed-off-by: Yejin Seo <[email protected]>

Author: yejseo01

e2e/test_helpers.go

@@ -0,0 +1,11 @@
+package e2e
+
+import (
+	"sync/atomic"
+)
+
+var testCounter atomic.Uint32
+
+func getTestNumber() uint {
+	return uint(testCounter.Add(1))
+}