ES|QL: unmute generative tests and reduce forks (#130428)

Author: luigidellaquila

muted-tests.yml

@@ -540,14 +540,8 @@ tests:
 - class: org.elasticsearch.xpack.inference.qa.mixed.CohereServiceMixedIT
   method: testCohereEmbeddings
   issue: https://github.com/elastic/elasticsearch/issues/130010
-- class: org.elasticsearch.xpack.esql.qa.multi_node.GenerativeIT
-  method: test
-  issue: https://github.com/elastic/elasticsearch/issues/130067
 - class: geoip.GeoIpMultiProjectIT
   issue: https://github.com/elastic/elasticsearch/issues/130073
-- class: org.elasticsearch.xpack.esql.qa.single_node.GenerativeIT
-  method: test
-  issue: https://github.com/elastic/elasticsearch/issues/130067
 - class: org.elasticsearch.xpack.esql.action.EnrichIT
   method: testTopN
   issue: https://github.com/elastic/elasticsearch/issues/130122

x-pack/plugin/esql/qa/server/src/main/java/org/elasticsearch/xpack/esql/qa/rest/generative/command/pipe/ForkGenerator.java

@@ -34,7 +34,7 @@ public CommandDescription generate(
             }
         }
 
-        int n = randomIntBetween(2, 8);
+        int n = randomIntBetween(2, 3);
 
         String cmd = " | FORK " + "( WHERE true ) ".repeat(n) + " | WHERE _fork == \"fork" + randomIntBetween(1, n) + "\" | DROP _fork";