Fix failing UT by adding a required capability (elastic#132947)

Fix failing UT by adding a required capability

Author: julian-elastic

muted-tests.yml

@@ -507,9 +507,6 @@ tests:
 - class: org.elasticsearch.test.rest.yaml.CcsCommonYamlTestSuiteIT
   method: test {p0=search/410_named_queries/named_queries_with_score}
   issue: https://github.com/elastic/elasticsearch/issues/132906
-- class: org.elasticsearch.xpack.esql.qa.mixed.EsqlClientYamlIT
-  method: test {p0=esql/230_folding/CIDR_MATCH with non-foldable CIDRs}
-  issue: https://github.com/elastic/elasticsearch/issues/132931
 - class: org.elasticsearch.packaging.test.ArchiveGenerateInitialCredentialsTests
   method: test40VerifyAutogeneratedCredentials
   issue: https://github.com/elastic/elasticsearch/issues/132877

x-pack/plugin/src/yamlRestTest/resources/rest-api-spec/test/esql/230_folding.yml

@@ -1,8 +1,13 @@
 ---
 setup:
   - requires:
+      capabilities:
+        - method: POST
+          path: /_query
+          parameters: [ ]
+          capabilities: [ dense_vector_field_type ]
       test_runner_features: [ capabilities, contains ]
-      reason: "make sure new functions run where supported only"
+      reason: "make sure new functions run where supported only, dense vector needed for index creation"
   - do:
       indices.create:
         index: employees