Improve errdetail for logical replication conflict messages.

This change enhances the clarity and usefulness of error detail messages
generated during logical replication conflicts. The following improvements
have been made:

1. Eliminate redundant output: Avoid printing duplicate remote row and
replica identity values for the multiple_unique_conflicts conflict type.
2. Improve message structure: Append tuple values directly to the main
error message, separated by a colon (:), for better readability.
3. Simplify local row terminology: Remove the word 'existing' when
referring to the local row, as this is already implied by context.
4. General code refinements: Apply miscellaneous code cleanups to improve
how conflict detail messages are constructed and formatted.

Author: Hayato Kuroda <[email protected]>
Reviewed-by: Shveta Malik <[email protected]>
Reviewed-by: Amit Kapila <[email protected]>
Reviewed-by: Masahiko Sawada <[email protected]>
Reviewed-by: Zhijie Hou <[email protected]>
Discussion: 
https://postgr.es/m/cahut+psgkwy5-ygrjc15izecysggysrbcszv_z93ess8xtc...@mail.gmail.com

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/48efefa6caacba49ca5b7b84e20c900776e56c50

Modified Files
--------------
doc/src/sgml/logical-replication.sgml      |  23 ++-
src/backend/replication/logical/conflict.c | 248 +++++++++++++++++------------
src/include/replication/conflict.h         |   2 +-
src/test/subscription/t/001_rep_changes.pl |   6 +-
src/test/subscription/t/013_partition.pl   |  14 +-
src/test/subscription/t/029_on_error.pl    |   2 +-
src/test/subscription/t/030_origin.pl      |   4 +-
src/test/subscription/t/035_conflicts.pl   |  42 +++--
8 files changed, 192 insertions(+), 149 deletions(-)

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