pgsql: Stabilize xid_wraparound tests

Stabilize xid_wraparound tests

The tests had a race condition if autovacuum was set to off. Instead we
create all the tables we are interested in with autovacuum disabled, so
they are only ever touched when in danger of wraparound.

Discussion: https://postgr.es/m/3e2cbd24-f45e-4b2b-ba83-8149214f0a4d@dunslane.net

Masahiko Sawada (slightly tweaked by me)

Backpatch to release 17 where these tests were introduced.

Branch
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REL_17_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/787ea8c9d812e5ae76b7a8981e5f93cee80c8a36

Modified Files
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.../xid_wraparound/t/001_emergency_vacuum.pl       | 28 ++++++++++------------
src/test/modules/xid_wraparound/t/002_limits.pl    |  6 ++---
.../modules/xid_wraparound/t/003_wraparounds.pl    |  6 ++---
3 files changed, 19 insertions(+), 21 deletions(-)