Move ES|QL sample command from snapshot to tech preview

Author: jan-elastic

x-pack/plugin/esql/src/main/java/org/elasticsearch/xpack/esql/action/EsqlCapabilities.java

@@ -1082,7 +1082,7 @@ public enum Cap {
         /**
          * Support for the SAMPLE command
          */
-        SAMPLE_V3(Build.current().isSnapshot()),
+        SAMPLE_V3,
 
         /**
          * The {@code _query} API now gives a cast recommendation if multiple types are found in certain instances.
@@ -1207,7 +1207,7 @@ public enum Cap {
         /**
          * Support parameters for SAMPLE command.
          */
-        PARAMETER_FOR_SAMPLE(Build.current().isSnapshot());
+        PARAMETER_FOR_SAMPLE;
 
         private final boolean enabled;