fix(medusa, admin-ui): Add deleted_at to Return Reason unique constraint (#4834)

* Update return reason create to upsert

* Create strange-wombats-invite.md

* Revert upsert, make value index only apply on non-deleted entities

.changeset/strange-wombats-invite.md

@@ -0,0 +1,7 @@
+---
+"@medusajs/medusa": patch
+"@medusajs/admin-ui": patch
+"@medusajs/admin": patch
+---
+
+fix(medusa, admin-ui): Allow soft-deleted return reason restoration