Fix test_remote_initiator_after_non_remote

[ianton-ru]

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Fix test_storage_iceberg_with_spark/test_remote_initiator.py::test_remote_initiator_after_non_remote

Documentation entry for user-facing changes

node1 chooses random node from cluster cluster_simple as remote initiator.
But node1 is a member of cluster_simple, and with chance 1/3 it chooses itself.
In this case later optimization 'if remote request is to current node, do not make remote request' makes request as non-remote again, and query creates less subqueries than expected.

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Workflow [PR], commit [b2ffe81]