Stop gathering yolo26 for the portable CI matrix

[shoumikhin]

test-models-linux (yolo26, portable) has been red since yolo26 was added and has never had a green run, so it produces no signal and just adds noise to every periodic run.

yolo26 is registered in the shared model registry (examples/models/__init__.py), and gather_test_models.py expands every registry entry across the portable and xnnpack backends. yolo26 is not in MODEL_NAME_TO_OPTIONS, so the xnnpack variant is already skipped, which means the portable job is the only one this gather step ever produced.

This change skips yolo26 in the gather step. Verified locally by running the script before and after: the gathered matrix goes from 53 records to 52, and the only record removed is

{'build-tool': 'cmake', 'model': 'yolo26', 'backend': 'portable', 'runner': 'linux.2xlarge', 'timeout': 90}

The model itself, its example code, and its OpenVINO / XNNPACK / RISC-V paths are all untouched.

@daniil-lyakhov flagging you since you added yolo26 in #18583. If you do want portable coverage for it, the fix is to make it export cleanly on the portable backend and then drop this skip. Happy to revert this if you pick it up.

[pytorch-bot]

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[digantdesai]

Add a TODO issue?

[shoumikhin]

Good call, filed #21621 and referenced it from the skip so it does not become permanent by accident.

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