fix: filter Accounts Receivable by invoice sales partner (#57628)
Filter Accounts Receivable and AR Summary on the Sales Invoice's own
sales_partner instead of the customer's default_sales_partner, and read
the Sales Partner column from the invoice. Returns are attributed to the
invoice they settle, matching how the Sales Person filter works.
(cherry picked from commit fd7765ac02)
Co-authored-by: Jatin3128 <140256508+Jatin3128@users.noreply.github.com>