Merged PR 4077: Propagate account code and account name for Xero - reporting models

# Description

Propagate account code and account name for Xero reporting models, specifically:
* xero__credit_note_line_items
* xero__invoice_line_items
* xero__sales_denom_mart

These are already available in intermediate models. This is independent from KPIs, but I feel like we should propagate this to reporting since are useful fields for accounting purposes. Happy to discuss if this needs to be reflected in PBI.

# Checklist

- [X] The edited models and dependants run properly with production data.
- [X] The edited models are sufficiently documented.
- [X] The edited models contain PK tests, and I've ran and passed them.
- [NA] I have checked for DRY opportunities with other models and docs.
- [NA] I've picked the right materialization for the affected models.

# Other

- [ ] Check if a full-refresh is required after this PR is merged.

Related work items: #26531

models/reporting/xero/xero__invoice_line_items.sql

@@ -8,6 +8,8 @@ select
     id_line_item as id_line_item,
     id_item as id_item,
     item_code as item_code,
+    account_code as account_code,
+    account_name as account_name,
     quantity as quantity,
     unit_amount as unit_amount,
     line_amount_local_curr as line_amount_local_curr,