RobotWebTools / rclnodejs / 34455545203

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Prevent abort listener leaks in async client requests (#1597)

This PR tightens `Client.sendRequestAsync()` resource cleanup by ensuring abort/timeout listeners are removed in all completion paths (success, abort, timeout, and synchronous failures), preventing listener accumulation across repeated async requests.

**Changes:**
- Add explicit cleanup of `abort`/`timeout` listeners in `sendRequestAsync()` via shared `cleanup()` + named handlers.
- Add tests that assert abort/timeout listeners are fully released after each request outcome (including pre-aborted signals and send/serialization failures).

Fix: #1596

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