[Subtask]: Do not manual cleanup idle connections #23225
Description
Parent Issue
Detail of Subtask
Rely on http.Transport’s built‑in idle management (e.g., IdleConnTimeout, MaxIdleConns, MaxIdleConnsPerHost) instead of forcibly closing all idle connections on a fixed short interval (PutIdleConn)
Describe implementation you've considered
No response
Additional information
No response