Improve some publication-related error messages
While at it, remove an unused queryString parameter from
CheckPubRelationColumnList() and make other minor stylistic changes.
Backpatch to 15.
Reported by Kyotaro Horiguchi <horikyota.ntt@gmail.com>
Co-authored-by: Hou zj <houzj.fnst@fujitsu.com>
Discussion: https://postgr.es/m/
20220926.160426.
454497059203258582.horikyota.ntt@gmail.com