Desktop: list every trained pipe, not just the first

[mattdawkins]

• VIAME training can emit both category_models/detector.pipe and tracker.pipe. getPipelineList used find to take the first .pipe in readdir order and dropped the rest, so the tracker was never runnable from desktop (which one won was FS-dependent: alphabetical on NTFS, hash order on ext4).
• Now emits one trained entry per .pipe, sorted for deterministic order, suffixed detector / tracker to match web (crud_rpc.py:_load_dynamic_pipelines).
• Single-pipe models still produce exactly one entry; their display name gains the detector suffix, same as web.
• Deleting either entry still removes the whole model folder, unchanged and identical to web.
• Spec: new detectorAndTrackerTrainingJob fixture with both pipes + test asserting two entries; existing trained test now pins the name. 118 passed, eslint clean.

🤖 Generated with Claude Code

https://claude.ai/code/session_01Nzq6XQBXKUb1NRdaVpPYQZ

[BryonLewis]

This looks proper, before we were just grabbing the detectors because I believe we didn't have trackers initially. This looks like it