Update assertion to use model_dump for comparison

[hombit]

It has much nicer diff message when things fail

Previously:

  Full diff:
    catalog_name      small_sky_from_dataframe
    catalog_type      object
    total_rows        111
    ra_column         ra
    dec_column        dec
    healpix_column    _healpix_29
    healpix_order     29
    npix_suffix       .parquet
    skymap_order      8
    skymap_alt_orders 1 2
    hats_max_rows     111
    hats_max_bytes    1073741824

After:

Full diff:
    {
        'assn_max_separation': None,
        'catalog_name': 'small_sky_from_dataframe',
        'catalog_type': 'object',
        'contains_leaf_files': None,
        'dec_column': 'dec',
        'default_columns': None,
        'extra_columns': None,
        'hats_builder': 'lsdb v0.7.4.dev25+g3714254d2, hats v0.7.4.dev8+g369ce88f8',
        'hats_creation_date': None,
        'hats_estsize': None,
        'hats_max_bytes': 1073741824,
  -     'hats_max_rows': '111',
  ?                      -   -
  +     'hats_max_rows': 111,
        'hats_release_date': '2025-08-22',
        'hats_version': 'v1.0',
        'healpix_column': '_healpix_29',
        'healpix_order': 29,
        'indexing_column': None,
        'join_catalog': None,
        'join_column': None,
        'join_column_association': None,
        'margin_threshold': None,
        'npix_suffix': '.parquet',
        'obs_regime': 'Optical',
        'primary_catalog': None,
        'primary_column': None,
        'primary_column_association': None,
        'ra_column': 'ra',
        'skymap_alt_orders': '1 2',
        'skymap_order': 8,
        'total_rows': 111,
    }

[github-actions]

Before [7f03c42]	After [b3651b5]	Ratio	Benchmark (Parameter)
failed	failed	n/a	benchmarks.BenchmarksCDSHTTP.time_gaia
851±40ms	failed	n/a	benchmarks.BenchmarksHTTP.time_gaia
360M	365M	1.01	benchmarks.BenchmarksHTTP.peakmem_gaia
419M	418M	1.00	benchmarks.BenchmarksS3.peakmem_euclid
814±0.6ms	787±5ms	0.97	benchmarks.BenchmarksS3.time_euclid

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