Muting tests for elastic#129078 and elastic#129082 until fix elastic#129202 is merged (elastic#129241)

Author: carlosdelest

muted-tests.yml

@@ -224,6 +224,12 @@ tests:
   - class: org.elasticsearch.discovery.ClusterDisruptionIT
     method: testAckedIndexing
     issue: https://github.com/elastic/elasticsearch/issues/117024
+  - class: org.elasticsearch.xpack.esql.qa.mixed.MixedClusterEsqlSpecIT
+    method: test {lookup-join.LookupJoinOnTimeSeriesIndex ASYNC}
+    issue: https://github.com/elastic/elasticsearch/issues/129078
+  - class: org.elasticsearch.xpack.esql.qa.mixed.MixedClusterEsqlSpecIT
+    method: test {lookup-join.LookupJoinOnTimeSeriesIndex SYNC}
+    issue: https://github.com/elastic/elasticsearch/issues/129078
 
   # Examples:
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