Parameterize existing tests with @for_all_simd_levels

[algoriddle]

Summary:
Expand DD test coverage by applying for_all_simd_levels to existing test
classes that exercise DD-dispatched code paths but were previously pinned
to a single SIMD level.

This is the "mega decorator" diff from the DD test coverage gaps plan --
pure decorator additions, no new test logic. Follow-up diffs add new
test files and numerical cross-level assertions for gaps the decorator
alone cannot close.

Classes decorated (grouped by area):

• Binary Hamming non-IVF: TestRange and TestKnn in
  test_binary_hashindex.py; TestBinarySearchParams in
  test_binary_search_params.py; TestIndexBinaryFromFloat in
  test_index_binary_from_float.py; TestSpectralHash in
  test_index_accuracy.py.

• IVFPQ / search: EvalIVFPQAccuracy in test_index.py;
  TestSelector and TestSearchParams in test_search_params.py.

• Flat / refine / Panorama: TestIndexFlat, TestIndexFlatL2,
  TestIndexFlatL2Panorama, TestScalarQuantizer in test_index.py;
  TestDistanceComputer, TestIndexRefineSearchParams,
  TestIndexRefineRangeSearch in test_refine.py;
  TestIndexRefinePanorama, TestIndexFlatPanorama,
  TestIndexHNSWFlatPanorama, TestIndexIVFFlatPanorama in their
  respective files.

• Quantizer encode: TestResidualQuantizer,
  TestIndexResidualQuantizerSearch in test_residual_quantizer.py;
  TestComponents, TestLocalSearchQuantizer in
  test_local_search_quantizer.py.

• Fast scan: TestFastScanFiltering, TestBlockSkipConsistency,
  TestFastScanRangeSearchFilter in test_fastscan_filter.py.

• Broader index tests (search-exercising classes only):
  TestParameterSpace in test_autotune.py; TestSpectralHash in
  test_factory.py; TestMerge1, TestMerge2, TestRemoveFastScan in
  test_merge_index.py.

BUCK changes move decorated tests from the legacy-listing lists to the
simd_levels lists (which use supports_static_listing = False, required
for dynamic class name generation), and add the new entries
test_binary_search_params, test_fastscan_filter, test_refine_panorama,
test_hnsw_panorama.

Differential Revision: D101822335

[meta-codesync]

@algoriddle has exported this pull request. If you are a Meta employee, you can view the originating Diff in D101822335.

[meta-codesync]

This pull request has been merged in f4338ad.