Select expense class for Order & Invoice Fund distribution

Overview: In order to use expense types they need to be selected when user is adding Fund distribution(s) to orders and invoices

Acceptance criteria:
1)
Given user has added a fund distribution
When the Fund selected has expense class(s)
Then expense class select box is shown

2)
Given user has selected a FUND with ONLY 1 expense class
When Fund is selected
Then expense class is chosen by default
AND expense class Name is displayed in field

3)
Given user has selected a FUND with more than 1 expense class
When Fund is selected
Then expense class select box is shown
AND user MUST select an expense class (Expense type is required)
AND expense class Name is displayed in field

4)
Given user has selected a FUND with more than 1 expense class
When Fund is selected
Then expense class select box is shown
AND ONLY ACTIVE expense classes display in select box

5)
Given user has selected an invoice with an expense class that is now inactive
When User clicks approve invoice
Then system throws error message "inactiveExpenseClass"
AND UI displace the following toast message:
"Invoice can NOT be (action) because (expense class) is inactive."