We were using generic names like `args` and `options` which don't really
add anything to `*` or `**` because Ruby required us to.
That's no longer the case in Ruby 3.2, so we can simplify the code a
bit.
Both these objects where using/setting a variable called valid_orders.
As a results, some specs where becoming flacky
(features/budgets/investments_spec.rb, balloting phase). By putting
them together, there is no `valid_orders` variable any more (everything
is @valid_orders) and the flackyness is gone.
