pg_restore: Fix comment handling with --no-policies.

pg_restore: Fix comment handling with --no-policies.

Previously, pg_restore did not skip comments on policies even when
--no-policies was specified. As a result, it could issue COMMENT commands
for policies that were never created, causing those commands to fail.

This commit fixes the issue by ensuring that comments on policies
are also skipped when --no-policies is used.

Backpatch to v18, where --no-policies was added in pg_restore.

Author: Jian He <jian.universality@gmail.com>
Co-authored-by: Fujii Masao <masao.fujii@gmail.com>
Discussion: https://postgr.es/m/CACJufxHCt00pR9h51AVu6+yPD5J7JQn=7dQXxqacj0XyDhc-fA@mail.gmail.com
Backpatch-through: 18