fix: cast money columns to numeric (#5705)
[TML-1657](https://linear.app/prisma-company/issue/TML-1657/fix-dbmoney-parsing-issues)
Parsing money values returned from Postgres is incredibly complicated
due to it being dependent on locale and accepting a huge number of
formats. There's an easy trick to avoid all of that: do what we do for
enums and cast all money columns to `numeric`. This also allows us to
implement it once for both relationJoins and non-relationJoins code and
it conforms to our old behavior of always just returning the plain
number, while keeping the implementation simple.
Fixes https://github.com/prisma/prisma/issues/27570
