Enhance test cases related to scoring due to lucene 10 upgrade

[jngz-es]

As we upgraded to lucene 10 recently. Some original test cases were broken by the new changes of scoring as https://issues.apache.org/jira/browse/LUCENE-8563.

A sample assert is like assertThat(sr.getHits().getAt(0).getScore(), Matchers.greaterThanOrEqualTo(29.0f)); from https://github.com/opensearch-project/opensearch-learning-to-rank-base/blob/main/src/javaRestTest/java/com/o19s/es/ltr/query/StoredLtrQueryIT.java#L121.

Basically the single absolute score as above 29.0f is not meaningful to test, the test case shouldn't depend on it, as we only care about ranking. We might construct a baseline, then compare with it to test. Otherwise, we could keep facing the same test failures in the future lucene scoring changes.