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Check that auto_vacuum is disabled when porting a SQLite database to Postgres, as VACUUMs must not be performed between runs of the script. (#13195)

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@ -143,6 +143,14 @@ to do step 2.
It is safe to at any time kill the port script and restart it.
However, under no circumstances should the SQLite database be `VACUUM`ed between
multiple runs of the script. Doing so can lead to an inconsistent copy of your database
into Postgres.
To avoid accidental error, the script will check that SQLite's `auto_vacuum` mechanism
is disabled, but the script is not able to protect against a manual `VACUUM` operation
performed either by the administrator or by any automated task that the administrator
may have configured.
Note that the database may take up significantly more (25% - 100% more)
space on disk after porting to Postgres.