test: fix ut random float

[iaojnh]

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[greptile-apps]

Greptile Summary

Fixed flaky unit tests caused by floating point precision issues by replacing exact equality assertions with appropriate floating point comparison macros.

• Replaced EXPECT_EQ and ASSERT_EQ with EXPECT_FLOAT_EQ, ASSERT_FLOAT_EQ, and EXPECT_DOUBLE_EQ for float/double comparisons across test files
• Widened tolerance in ASSERT_NEAR calls for quantized integer metric tests to account for precision variability in quantized data
• Renamed hnsw_sparse_searcher_test.cc to hnsw_sparse_searcher_test.cpp for consistency

Confidence Score: 5/5

• This PR is safe to merge with minimal risk
• All changes are test-only fixes that properly address floating point comparison issues using standard GoogleTest macros, no production code affected
• No files require special attention

Important Files Changed

Filename	Overview
tests/core/algorithm/flat/flat_streamer_test.cc	Changed multiple ASSERT_EQ to ASSERT_FLOAT_EQ for vector data comparisons
tests/core/algorithm/hnsw/hnsw_streamer_test.cc	Changed multiple ASSERT_EQ to ASSERT_FLOAT_EQ for HNSW vector data comparisons
tests/core/algorithm/ivf/ivf_searcher_test.cc	Changed 69 instances of EXPECT_EQ to EXPECT_FLOAT_EQ for score comparisons across multiple test cases
tests/core/metric/quantized_integer_metric_test.cc	Widened ASSERT_NEAR tolerances for quantized integer metric comparisons to handle precision variability

_{Last reviewed commit: e7830a8}

[iaojnh]

@greptile

[iaojnh]

@greptile