Select All BUs in Promote to Spend Authorized

Summary:

In the Promote to Spend Authorized flow, the Create Sites section lists all Procurement BUs with an individual checkbox for each, and the user must select each Procurement BU one at a time to have a supplier site created in it. The same applies when initially creating a supplier with the Spend Authorized relationship.

For organizations with many Procurement BUs, this is slow and error-prone — it's easy to miss a BU, and there is no quick way to apply the selection consistently. There is currently no "Select All" (or bulk-select) option on this dialog, and because this is a standard application page, it cannot be addressed through configuration or Visual Builder Studio extensibility.