Allow rally to run ESQL operations on serverless for benchmarks (#1845)

* Allow rally to run esql track challenges.

* Mark as public to try to get `serverless` back in distribution.version

* Move back to internal, since it's not released yet.

* Mark public since, it's actually supposed to be public for realsies

esrally/track/track.py

@@ -701,7 +701,7 @@ class OperationType(Enum):
     CompositeAgg = (18, AdminStatus.No, serverless.Status.Public)
     WaitForCurrentSnapshotsCreate = (19, AdminStatus.No, serverless.Status.Internal)
     Downsample = (20, AdminStatus.No, serverless.Status.Internal)
-    Esql = (21, AdminStatus.No, serverless.Status.Blocked)
+    Esql = (21, AdminStatus.No, serverless.Status.Public)
 
     # administrative actions
     ForceMerge = (22, AdminStatus.Yes, serverless.Status.Internal)