ESQL: Propagate min transport version into query planning #136479
+421
−230
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Relates #131108
Make the minimum transport version available during query planning, so queries can be planned differently if older nodes (or remote clusters) are to take part in the query execution.
More specifically, plug the minimum transport version into:
Make the tests use a random compatible transport version per default. This should keep us on our toes for when query plans diverge on newer versions - this will normally require one test for the current transport version and another one for the previous versions.