Support non-prorated adjustment with included in relation

Purpose: Users currently can not create an invoice level adjustment that has a relation to total of "Included in". This means they can't indicate values at the invoice level that have been included in the price. As a result users must add these to each invoice line. Ideally for a tax adjustment like VAT they would be able to report for the invoice as a whole there was something like 19% VAT included in the price. This would show the tax amount as one lump sum that could be communicated out in the Voucher file. Without needing to attribute it to a specific Fund.

User story statement(s):

As a invoicing user,
I want to be able to add tax as a percentage included in the total at the invoice level
so that I can track what percentage of the value may be refunded to Accounts payable or does not need to be paid

Scenarios:

1. Scenario:
   • Given user is adding adjustment to invoice
   • When select a relation to total
   • Then user can choose "Included in"
   • AND it functions the way it would at the invoice line level:
     • Adjustment does not increase total amount of invoice

NOTE: fix in scope - When editing invoice line user also can not select "Included in" for relation to total.