ES|QL: Fix funciton Telemetry tests (elastic#116470)

Author: luigidellaquila

muted-tests.yml

@@ -112,9 +112,6 @@ tests:
 - class: org.elasticsearch.xpack.remotecluster.RemoteClusterSecurityWithApmTracingRestIT
   method: testTracingCrossCluster
   issue: https://github.com/elastic/elasticsearch/issues/112731
-- class: org.elasticsearch.xpack.test.rest.XPackRestIT
-  method: test {p0=esql/60_usage/Basic ESQL usage output (telemetry)}
-  issue: https://github.com/elastic/elasticsearch/issues/115231
 - class: org.elasticsearch.xpack.inference.DefaultEndPointsIT
   method: testInferDeploysDefaultE5
   issue: https://github.com/elastic/elasticsearch/issues/115361
@@ -279,9 +276,6 @@ tests:
 - class: org.elasticsearch.smoketest.MlWithSecurityIT
   method: test {yaml=ml/inference_crud/Test force delete given model with alias referenced by pipeline}
   issue: https://github.com/elastic/elasticsearch/issues/116443
-- class: org.elasticsearch.xpack.test.rest.XPackRestIT
-  method: test {p0=esql/60_usage/Basic ESQL usage output (telemetry) non-snapshot version}
-  issue: https://github.com/elastic/elasticsearch/issues/116448
 - class: org.elasticsearch.xpack.downsample.ILMDownsampleDisruptionIT
   method: testILMDownsampleRollingRestart
   issue: https://github.com/elastic/elasticsearch/issues/114233

x-pack/plugin/src/yamlRestTest/resources/rest-api-spec/test/esql/60_usage.yml

@@ -162,4 +162,4 @@ setup:
   - match: {esql.functions.cos: $functions_cos}
   - gt: {esql.functions.to_long: $functions_to_long}
   - match: {esql.functions.coalesce: $functions_coalesce}
-  - length: {esql.functions: 118} # check the "sister" test above for a likely update to the same esql.functions length check
+  - length: {esql.functions: 116} # check the "sister" test above for a likely update to the same esql.functions length check