Improve various new-to-v19 appendStringInfo calls

David Rowley <drowley@postgresql.org>

Commit: 49ce41810faca2722424b3d8fabda79bf4902339
Author: David Rowley <drowley@postgresql.org>
Date: 2026-04-13T01:16:48Z
Improve various new-to-v19 appendStringInfo calls

Similar to 928394b66 and 8461424fd, here we adjust a few new locations
which were not using the most suitable appendStringInfo* or
appendPQExpBuffer* function for the intended purpose.

Author: David Rowley <drowleyml@gmail.com>
Discussion: https://postgr.es/m/CAApHDvohYOdrvhVxXzCJNX_GYMSWBfjTTtB6hgDauEtZ8Nar2A@mail.gmail.com

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