chore(OUT-3720): update query to add column if not exist

Author: SandipBajracharya

src/db/migrations/20260514095346_add_qb_doc_number_column_in_qb_invoice_sync.sql

@@ -1 +1 @@
-ALTER TABLE "qb_invoice_sync" ADD COLUMN "qb_doc_number" varchar;
+ALTER TABLE "qb_invoice_sync" ADD COLUMN IF NOT EXISTS "qb_doc_number" varchar;