Merged PR 4568: Adds flag to identify invoices/credit notes that are posted in Hyperline

# Description

Adds flag to identify invoices/credit notes that are posted in Hyperline.
For Invoices, these need to be ACCREC and follow a convention of 20XX-Y
For Credit Notes, these need to be ACCRECCREDIT and follow a convention of CN-20XX-Y

# 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.
- [X] I have checked for DRY opportunities with other models and docs.
- [X] 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: #28146

models/reporting/xero/xero__credit_notes.sql

@@ -5,6 +5,7 @@ select
     id_contact as id_contact,
     reference as reference,
     credit_note_number as credit_note_number,
+    is_credit_note_posted_in_hyperline as is_credit_note_posted_in_hyperline,
     credit_note_issued_at_utc as credit_note_issued_at_utc,
     credit_note_issued_date_utc as credit_note_issued_date_utc,
     credit_note_type as credit_note_type,