pgsql: Rename two columns in pg_stat_subscription_stats.

Rename two columns in pg_stat_subscription_stats.

This patch renames the sync_error_count column to sync_table_error_count
in the pg_stat_subscription_stats view. The new name makes the purpose
explicit now that a separate column exists to track sequence
synchronization errors.

Additionally, the column seq_sync_error_count is renamed to
sync_seq_error_count to maintain a consistent naming pattern, making it
easier for users to group, and query synchronization related counters.

Author: Vignesh C <vignesh21(at)gmail(dot)com>
Reviewed-by: Peter Smith <smithpb2250(at)gmail(dot)com>
Reviewed-by: Chao Li <li(dot)evan(dot)chao(at)gmail(dot)com>
Discussion: https://postgr.es/m/CALDaNm3WwJmz=-4ybTkhniB-Nf3qmFG9Zx1uKjyLLoPF5NYYXA@mail.gmail.com

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/3edaf29fa5e0d4fd6419c7eb73fd6df5b0406789

Modified Files
--------------
doc/src/sgml/monitoring.sgml | 4 ++--
src/backend/catalog/system_views.sql | 4 ++--
src/backend/utils/activity/pgstat_subscription.c | 8 ++++----
src/backend/utils/adt/pgstatfuncs.c | 12 ++++++------
src/include/catalog/catversion.h | 2 +-
src/include/catalog/pg_proc.dat | 2 +-
src/include/pgstat.h | 8 ++++----
src/test/regress/expected/rules.out | 6 +++---
src/test/subscription/t/026_stats.pl | 22 +++++++++++-----------
9 files changed, 34 insertions(+), 34 deletions(-)