Account Management - allow searching active accounts by product

BCOL Admin would like to search active accounts and filter the search by product. e.g. only see accounts that have PPR selected.

This should also include the new director search.

https://www.figma.com/design/NcchZlxVp502zeoiCLeMgi/Account-Management-Enhancements?node-id=2445-4962&t=yGeUP2Ih5FdPNejr-4

Start with the linked Figma design and inspect the existing active-account search and director-search entry points. Trace how product selection is represented and how search results are loaded; the work is done when active accounts can be filtered by product and the new director search includes the same capability.

Written by the indexing model from the issue text.