fix(medusa-plugin-brightpearl): Add bp from sales channel of order where possible (#4160)

* add bp from sales channel of order where possible

* add changeset

* correct typo

* Add missing relations

---------

Co-authored-by: olivermrbl <oliver@mrbltech.com>

.changeset/itchy-flowers-hug.md

@@ -0,0 +1,5 @@
+---
+"medusa-plugin-brightpearl": patch
+---
+
+fix(medusa-plugin-bright-pearl): update order creation to include sales channel brightpearl id where possible