Add D400_CAM_SYNC directive to libCI framework and initial cam_sync tests

[ttkhuong]

1. Add special composite categories D400_CAM_SYNC
2. D400_CAM_SYNC requires two D400 devices, excluding D405 (no sync port)
3. Added libCI tests for sync mode and sync verification
4. Added test-sync-mode.py
5. Added test-sync-depth-fps-performance.py
6. Added test-sync-stream.py (disable for now)

Requirements:

• Two D400 cameras (D405 excluded as it lacks sync port)
• Cameras are connected via sync cable
• FW version >= 5.15.0.0 for inter_cam_sync_mode support

[sysrsbuild-gh]

Can one of the admins verify this patch?

[ttkhuong]

Rebase

[Copilot]

Pull request overview

This PR adds support for synchronized dual-camera testing in the libCI framework by introducing the D400_CAM_SYNC device directive and implementing comprehensive sync mode tests.

Changes:

• Added D400_CAM_SYNC composite category requiring two D400 devices (excluding D405)
• Implemented inter-camera sync mode tests including mode configuration, FPS performance validation, and timestamp drift analysis
• Added three test files for sync functionality validation

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
unit-tests/py/rspy/libci.py	Added documentation comment for D400_CAM_SYNC directive
unit-tests/py/rspy/devices.py	Implemented D400_CAM_SYNC composite category logic with device selection and validation
unit-tests/live/camera-sync/test-sync-stream.py	Comprehensive timestamp drift analysis test comparing MASTER-SLAVE vs DEFAULT sync modes
unit-tests/live/camera-sync/test-sync-mode.py	Basic sync mode configuration validation test
unit-tests/live/camera-sync/test-sync-depth-fps-performance.py	Dual-camera FPS accuracy test for all supported depth configurations

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