Improve various new-to-v18 appendStringInfo calls

David Rowley <drowley@postgresql.org>

Commit: 928394b664bc4afef2fe6dc69a70e4074886e065
Author: David Rowley <drowley@postgresql.org>
Date: 2025-04-10T22:07:22Z
Releases: 18.0
Improve various new-to-v18 appendStringInfo calls

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

Author: David Rowley <drowleyml@gmail.com
Discussion: https://postgr.es/m/CAApHDvqJnNjueb=Eoj8K+8n0g7nj_AcPWSiCj5RNV4fDejAfqA@mail.gmail.com

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