Fix dumping role comments when using --no-role-passwords

Commit 9a83d56b38c added support for allowing pg_dumpall to dump
roles without including passwords, which accidentally made dumps
omit COMMENTs on roles.  This fixes it by using pg_authid to get
the comment.

Backpatch to all supported versions. Patch simultaneously written
independently by Álvaro and myself.

Author: Álvaro Herrera <alvhe...@alvh.no-ip.org>
Author: Daniel Gustafsson <dan...@yesql.se>
Reported-by: Bartosz Chroł <bartosz.ch...@handen.pl>
Discussion: 
https://postgr.es/m/as8p194mb1271cda0adca7b75fcd8e767f7...@as8p194mb1271.eurp194.prod.outlook.com
Discussion: 
https://postgr.es/m/CAEP4nAz9V4H41_4ESJd1Gf0v%3DdevkqO1%3Dpo91jUw-GJSx8Hxqg%40mail.gmail.com
Backpatch-through: v12

Branch
------
REL_13_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/affc46b76d50a42c44ae1322545769eceaa509c6

Modified Files
--------------
src/bin/pg_dump/pg_dumpall.c | 21 ++++++++++++---------
1 file changed, 12 insertions(+), 9 deletions(-)

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