Fix: update the BLOCKED_DEVICE_TIMEOUT to 2 hours to avoid devices gets blocked issue

[zhou9584]

Description

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Pull Request Checklist

• Tests for the changes have been added (for bug fixes / features)
• Code compiles correctly with all tests are passed.
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[Copilot]

Pull Request Overview

This PR updates the BLOCKED_DEVICE_TIMEOUT constant from 4 hours to 2 hours to reduce the duration devices remain blocked.

• Updated the timeout value in the DeviceGroup constant.