Parameterize existing tests with @for_all_simd_levels (#5134)

Summary:
Pull Request resolved: https://github.com/facebookresearch/faiss/pull/5134

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.

___

overriding_review_checks_triggers_an_audit_and_retroactive_review
Oncall Short Name: fair_umami_cluster

Differential Revision: D101822335

fbshipit-source-id: 9a432c6d6bee201c3731713226405a8c8ecebbe6

tests/test_local_search_quantizer.py

@@ -13,6 +13,7 @@ import platform
 import faiss
 import unittest
 
+from common_faiss_tests import for_all_simd_levels
 from faiss.contrib import datasets
 
 faiss.omp_set_num_threads(4)
@@ -117,6 +118,7 @@ def icm_encode_ref(x, codebooks, codes):
     return codes
 
 
+@for_all_simd_levels
 class TestComponents(unittest.TestCase):
 
     def test_decode(self):
@@ -332,6 +334,7 @@ def eval_codec(q, xb):
     return ((xb - decoded) ** 2).sum()
 
 
+@for_all_simd_levels
 class TestLocalSearchQuantizer(unittest.TestCase):
 
     def test_training(self):