pgsql: pg_recvlogical: Honor source cluster file permissions for output

pg_recvlogical: Honor source cluster file permissions for output files

Commit c37b3d08ca6 attempted to preserve group permissions on pg_recvlogical
output files when group access was enabled on the source cluster. However,
the output files were still created with a fixed S_IRUSR | S_IWUSR mode,
preventing group-read permissions from being applied.

This commit fixes the issue by creating output files with pg_file_create_mode
instead of a hard-coded mode. This allows pg_recvlogical to correctly preserve
group permissions from the source cluster.

Backpatch to all supported branches.

Author: Fujii Masao <masao(dot)fujii(at)gmail(dot)com>
Reviewed-by: Srinath Reddy Sadipiralla <srinath2133(at)gmail(dot)com>
Discussion: https://postgr.es/m/CAHGQGwHhpizYzMo3nFP4GkNMueSNMY3QfC-gBN1VTXtuiANDvw@mail.gmail.com
Backpatch-through: 14

Branch
------
REL_14_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/5552a15a3ed2de5b7f0afab9d55f107ebd824d35

Modified Files
--------------
doc/src/sgml/ref/pg_recvlogical.sgml | 2 +-
src/bin/pg_basebackup/pg_recvlogical.c | 2 +-
2 files changed, 2 insertions(+), 2 deletions(-)