Address when scores can be very large in osq score test (elastic#129592)

Using a static `diff` or epsilon just doesn't work for this test as the
scores can be very large, but relatively close. 

Maybe there is a simpler way, but my mind wasn't wanting to "math" very
much. 

For example, the seed that this previously failed on had scores like
`1.726524E9` and `1.7265239E9`, which, given their size, are really
close together (within 128). But a static epsilon wouldn't capture that.

closes: elastic#128485

Author: benwtrent

libs/simdvec/src/test/java/org/elasticsearch/simdvec/internal/vectorization/ES91OSQVectorScorerTests.java

@@ -125,12 +125,21 @@ public void testScore() throws Exception {
                             scores2
                         );
                         for (int j = 0; j < ES91OSQVectorsScorer.BULK_SIZE; j++) {
-                            if (scores1[j] > (maxDims * Short.MAX_VALUE)) {
-                                int diff = (int) (scores1[j] - scores2[j]);
-                                assertThat("defaultScores: " + scores1[j] + " bulkScores: " + scores2[j], Math.abs(diff), lessThan(65));
-                            } else if (scores1[j] > (maxDims * Byte.MAX_VALUE)) {
-                                int diff = (int) (scores1[j] - scores2[j]);
-                                assertThat("defaultScores: " + scores1[j] + " bulkScores: " + scores2[j], Math.abs(diff), lessThan(9));
+                            if (scores1[j] == scores2[j]) {
+                                continue;
+                            }
+                            if (scores1[j] > (maxDims * Byte.MAX_VALUE)) {
+                                float diff = Math.abs(scores1[j] - scores2[j]);
+                                assertThat(
+                                    "defaultScores: " + scores1[j] + " bulkScores: " + scores2[j],
+                                    diff / scores1[j],
+                                    lessThan(1e-5f)
+                                );
+                                assertThat(
+                                    "defaultScores: " + scores1[j] + " bulkScores: " + scores2[j],
+                                    diff / scores2[j],
+                                    lessThan(1e-5f)
+                                );
                             } else {
                                 assertEquals(scores1[j], scores2[j], 1e-2f);
                             }