pgsql: vacuumdb: Fix --analyze-in-stages skipping partitioned tables

vacuumdb: Fix --analyze-in-stages skipping partitioned tables

Commit 6429e5b77 changed vacuumdb to process partitioned tables when
--analyze-only or --analyze-in-stages is specified, matching the
documented behavior of analyzing regular tables, partitioned tables,
and materialized views.

Later, commit c4067383cb2 accidentally changed this behavior so that
partitioned tables were processed for --analyze-only, but skipped for
--analyze-in-stages.

As a result, vacuumdb --analyze-in-stages no longer matched its
documentation. Partitioned tables were skipped, leaving parent-table
statistics outdated even though users running vacuumdb
--analyze-in-stages after pg_upgrade, restore, or bulk loading would
expect statistics to be rebuilt for the database.

Fix this issue by making --analyze-in-stages process partitioned
tables again.

Author: Chao Li <lic(at)highgo(dot)com>
Reviewed-by: Fujii Masao <masao(dot)fujii(at)gmail(dot)com>
Discussion: https://postgr.es/m/EDFF0AFB-050F-4FBF-8D4F-B44DC454D957@gmail.com

Branch
------
master

Details
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https://git.postgresql.org/pg/commitdiff/95b6ec52e684e5de743e5bf4a2303f6cac466682

Modified Files
--------------
src/bin/scripts/t/100_vacuumdb.pl | 4 ++++
src/bin/scripts/vacuuming.c | 14 ++++++++------
2 files changed, 12 insertions(+), 6 deletions(-)