pg_createsubscriber: reword dry-run log messages

Álvaro Herrera <alvherre@kurilemu.de>

Commit: 2648eab3779b0204368f785f9df84de01270e537
Author: Álvaro Herrera <alvherre@kurilemu.de>
Date: 2025-10-31T17:49:50Z
pg_createsubscriber: reword dry-run log messages

The original messages were confusing in dry-run mode in that they state
that something is being done, when in reality it isn't.  Use alternative
wording in that case, to make the distinction clear.

Author: Peter Smith <smithpb2250@gmail.com>
Reviewed-by: Chao Li <li.evan.chao@gmail.com>
Reviewed-by: Euler Taveira <euler@eulerto.com>
Backpatch-through: 18
Discussion: https://postgr.es/m/CAHut+PsvQJQnQO0KT0S2oegenkvJ8FUuY-QS5syyqmT24R2xFQ@mail.gmail.com

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