Unmute tests

Author: carlosdelest

muted-tests.yml

@@ -162,9 +162,6 @@ tests:
   issue: https://github.com/elastic/elasticsearch/issues/117473
 - class: org.elasticsearch.repositories.s3.RepositoryS3EcsClientYamlTestSuiteIT
   issue: https://github.com/elastic/elasticsearch/issues/117525
-- class: org.elasticsearch.backwards.MixedClusterClientYamlTestSuiteIT
-  method: test {p0=synonyms/90_synonyms_reloading_for_synset/Reload analyzers for specific synonym set}
-  issue: https://github.com/elastic/elasticsearch/issues/116777
 - class: "org.elasticsearch.xpack.esql.qa.multi_node.EsqlSpecIT"
   method: "test {scoring.*}"
   issue: https://github.com/elastic/elasticsearch/issues/117641