Compare floats with allowable delta diff in VectorScorerFactoryTests (#126271)

As we do in similar tests elsewhere, this commit updates the comparison assertion of float scores with an allowable delta difference, in order to tolerate small rounding differences which may result from the order of accumulations.

Author: ChrisHegarty

libs/simdvec/src/test/java/org/elasticsearch/simdvec/VectorScorerFactoryTests.java

@@ -50,6 +50,8 @@
 // @com.carrotsearch.randomizedtesting.annotations.Repeat(iterations = 100)
 public class VectorScorerFactoryTests extends AbstractVectorTestCase {
 
+    private static final float DELTA = 1e-4f;
+
     // bounds of the range of values that can be seen by int7 scalar quantized vectors
     static final byte MIN_INT7_VALUE = 0;
     static final byte MAX_INT7_VALUE = 127;
@@ -278,7 +280,7 @@ void testRandomScorerImpl(long maxChunkSize, Function<Integer, float[]> floatArr
 
                         var expected = luceneScore(sim, qVectors[idx0], qVectors[idx1], correction, corrections[idx0], corrections[idx1]);
                         var scorer = factory.getInt7SQVectorScorer(VectorSimilarityType.of(sim), values, vectors[idx0]).get();
-                        assertThat(scorer.score(idx1), equalTo(expected));
+                        assertEquals(scorer.score(idx1), expected, DELTA);
                     }
                 }
             }