backporting rrf related test updates (#114257)

Author: pmpailis

muted-tests.yml

@@ -112,9 +112,6 @@ tests:
 - class: org.elasticsearch.xpack.ml.integration.MlJobIT
   method: testDeleteJobAsync
   issue: https://github.com/elastic/elasticsearch/issues/112212
-- class: org.elasticsearch.search.retriever.RankDocRetrieverBuilderIT
-  method: testRankDocsRetrieverWithCollapse
-  issue: https://github.com/elastic/elasticsearch/issues/112254
 - class: org.elasticsearch.smoketest.DocsClientYamlTestSuiteIT
   method: test {yaml=reference/rest-api/watcher/put-watch/line_120}
   issue: https://github.com/elastic/elasticsearch/issues/99517