Use camel case for "DateStyle" in some error messages

Michael Paquier <michael@paquier.xyz>

Commit: 2e7c4abe5a88a1528236a13c9ef2e351a97fa022
Author: Michael Paquier <michael@paquier.xyz>
Date: 2024-10-07T03:36:00Z
Releases: 18.0
Use camel case for "DateStyle" in some error messages

This GUC is written as camel-case in most of the documentation and the
GUC table (but not postgresql.conf.sample), and two error messages
hardcoded it with lower case characters.  Let's use a style more
consistent.

Most of the noise comes from the regression tests, updated to reflect
the GUC name in these error messages.

Author: Peter Smith
Reviewed-by: Peter Eisentraut, Álvaro Herrera
Discussion: https://postgr.es/m/CAHut+Pv-kSN8SkxSdoHano_wPubqcg5789ejhCDZAcLFceBR-w@mail.gmail.com

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