VACUUM VERBOSE is the source for flaky tests and we don't gain much
by including the verbose output in the test. Additionally removing
the verbose option prevents us from having to make the vacuum tests
pg-version specific as PG14 slightly changes the formatting of the
VACUUM VERBOSE output.
PG13 changes index vacuum behaviour in versions after 13.2 so
index vacuum is no longer triggered when inserting only.
This lead to test failures in the ABI test which was running
PG13 snapshot but will also lead to test differences between
13.2 and 13.3 when that is released.
This patch removes the indexes from the vacuum and vacuum multi
tests and makes them smaller for vacuum_parallel test to make
the size stable.
https://github.com/postgres/postgres/commit/9663d12
PG13 has introduced the parallel vacuum functionality in which if the
table has two or more indexes (with sizes beyond 512KB and enough number
of parallel worker processes), then the vacuum on those indexes can be
done in parallel.
