Added integration test to verify score_threshold parameter correctly filters results in Formula queries.

Changes

• New test: test_formula_with_score_threshold in tests/openapi/test_query_formula.py
  • Verifies threshold filtering at two boundary conditions (above/below 2nd highest score)
  • Validates all returned scores meet threshold requirement
  • Uses same fixture pattern as existing formula tests

query = {
    "prefetch": {"query": point_id},
    "query": {"formula": formula, "defaults": {"price": 0.0}},
    "score_threshold": threshold_value,
}

The test ensures the existing score_threshold handling in lib/segment/src/segment/formula_rescore.rs works correctly end-to-end.

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