Mute org.elasticsearch.xpack.esql.qa.mixed.MixedClusterEsqlSpecIT test {grok.OverwriteName SYNC} #118631

Author: elasticsearchmachine

muted-tests.yml

@@ -449,3 +449,6 @@ tests:
 - class: org.elasticsearch.discovery.ec2.DiscoveryEc2AvailabilityZoneAttributeNoImdsIT
   method: testAvailabilityZoneAttribute
   issue: https://github.com/elastic/elasticsearch/issues/118564
+- class: org.elasticsearch.xpack.esql.qa.mixed.MixedClusterEsqlSpecIT
+  method: test {grok.OverwriteName SYNC}
+  issue: https://github.com/elastic/elasticsearch/issues/118631