vacuumdb: Fix excluding multiple schemas with -N

When specifying multiple schemas to exclude with -N parameters, none
of the schemas are actually excluded (a single -N worked as expected).
This fixes the catalog query to handle multiple exclusions and adds a
test for this case.

Backpatch to v16 where this was introduced.

Author: Nathan Bossart <nathandboss...@gmail.com>
Author: Kuwamura Masaki <kuwam...@db.is.i.nagoya-u.ac.jp>
Reported-by: Kuwamura Masaki <kuwam...@db.is.i.nagoya-u.ac.jp>
Discussion: 
https://postgr.es/m/camyc8qp9mxpqd5d6s6cjxvmignsbtqgzwddb6vyjon1a8wg...@mail.gmail.com
Backpatch-through: 16

Branch
------
REL_16_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/2143d96dc7b72b62166d711283d5925b7180bf85

Modified Files
--------------
src/bin/scripts/t/100_vacuumdb.pl | 15 ++++++++++++++-
src/bin/scripts/vacuumdb.c        | 26 ++++++++++++++++----------
2 files changed, 30 insertions(+), 11 deletions(-)

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