Increase MIPI hw reset sleep from 3 to 8 seconds

[Nir-Az]

Summary

• Increase the Python-side sleep after MIPI hardware reset from 3 to 8 seconds
• MIPI devices (e.g. D457) don't physically disconnect/reconnect — the C++ layer simulates a 3s reconnect in d400-mipi-device.cpp, but the Python wait was too short for reliable re-enumeration on some machines
• We add this as a WA for a MIPI driver 1.0.2.23 reggresion

Test plan

• Run hw-reset tests on a GMSL/MIPI machine to verify devices come back online reliably

[Copilot]

Pull request overview

This PR increases the post–hardware-reset wait in the Python test utilities to improve reliability of re-enumeration for non-removable (e.g., MIPI) devices where the device may not physically disconnect/reconnect.

Changes:

• Increase the fixed sleep after HW reset for non-removable devices from 3s to 8s.
• Keep existing reset flow: trigger hardware_reset(), then wait for devices to be considered online again.

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