Revert change on YAML rest tests since elastic#80703 is not fixed.

Author: afoucret

x-pack/plugin/src/yamlRestTest/resources/rest-api-spec/test/ml/learn_to_rank_rescorer.yml

@@ -192,6 +192,10 @@ setup:
   - match: { hits.hits.4._score: 1.0 }
 ---
 "Test rescore with stored model and chained rescorers":
+  - skip:
+      version: all
+      reason: "@AwaitsFix https://github.com/elastic/elasticsearch/issues/80703"
+
   - do:
       search:
         index: store