Remove vacuumdb --analyze-in-stages from pg_upgrade tests
This step was only there to test the script when we generated those, but
commit
8f113698b6 removed those scripts, so it's not needed anymore.
Reported-By: Peter Eisentraut
Discussion: https://postgr.es/m/
ea403f46-2b33-a7de-618e-
9cab35a698c8@enterprisedb.com