Reduce dependency to money data type in main regression test suite

Reduce dependency to money data type in main regression test suite

Most of these tests have been introduced in 6dd8b0080787, to check for
behaviors related to hashing and hash plans, and money is a data type
with btree support but no hash functions.  These tests are switched to
use varbit instead, to provide the same coverage.

Some other tests historically used money but don't really need it for
what they wanted to test (see rules.sql).  Plans and coverage are
unchanged after the modifications done here.

Support for money may be removed a a later point, but this needs more
discussion.

Discussion: https://postgr.es/m/18240-c5da758d7dc1ecf0@postgresql.org