Update tiny model creation/upload scripts to use Hub-based summary repo
- Add `--organization` (required) and `--ignore-existing` flags to `update_tiny_models.py`
- Add `--summary-repo-id` to both scripts: fetches base `tiny_model_summary.json`
from a Hub repo, merges run results into it, and uploads back as
`tiny_model_summary.json` — replacing the old local `tests/utils/tiny_model_summary.json` workflow
- Rename merged output file from `updated_tiny_model_summary.json` to `merged_tiny_model_summary.json`
- Add `create_repo(exist_ok=True)` before upload to auto-create the summary repo if needed
- Use `EntryNotFoundError`/`RepositoryNotFoundError` instead of bare `except` when
fetching base summary, so unexpected errors propagate
- Update workflow: pass `--organization hf-tiny-v2`, `--summary-repo-id hf-tiny-v2/tiny-model-summary`,
`--num_workers 4`; restore upload and failure report steps; add token comments
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>