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/schema.yml

@@ -204,6 +204,14 @@ models:
         data_type: text
         description: A text based code that describes the Item.
 
+      - name: account_code
+        data_type: text
+        description: Accounting code for the related account.
+
+      - name: account_name
+        data_type: text
+        description: Name for the related account.
+
       - name: quantity
         data_type: numeric
         description: How much of the item is sold in its invoice.
@@ -643,6 +651,14 @@ models:
         data_type: text
         description: A text based code that describes the Item.
 
+      - name: account_code
+        data_type: text
+        description: Accounting code for the related account.
+
+      - name: account_name
+        data_type: text
+        description: Name for the related account.
+
       - name: quantity
         data_type: numeric
         description: How much of the item is credited in this credit note.
@@ -1179,6 +1195,14 @@ models:
         data_type: text
         description: ""
 
+      - name: account_code
+        data_type: text
+        description: Accounting code for the related account.
+
+      - name: account_name
+        data_type: text
+        description: Name for the related account.
+
       - name: quantity
         data_type: numeric
         description: ""