Use PqMsg_* macros in more places.

Nathan Bossart <nathan@postgresql.org>

Commit: a99cc6c6b4bf083d72fb1e8adfb665a449b7a37f
Author: Nathan Bossart <nathan@postgresql.org>
Date: 2024-07-17T15:51:00Z
Releases: 18.0
Use PqMsg_* macros in more places.

Commit f4b54e1ed9, which introduced macros for protocol characters,
missed updating a few places.  It also did not introduce macros for
messages sent from parallel workers to their leader processes.
This commit adds a new section in protocol.h for those.

Author: Aleksander Alekseev
Discussion: https://postgr.es/m/CAJ7c6TNTd09AZq8tGaHS3LDyH_CCnpv0oOz2wN1dGe8zekxrdQ%40mail.gmail.com
Backpatch-through: 17

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