Merged PR 4959: Exclude data from model to improve performance

# Description

Small changes to exclude "irrelevant" data. All data is relevant I guess but this is less.
* Exclude churned accounts after 3 months.
* Exclude any data after 24 months.

# 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.
- [ ] I have checked for DRY opportunities with other models and docs.
- [ ] 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: #28998

models/reporting/general/schema.yml

@@ -2335,6 +2335,12 @@ models:
       This model aggregates the historic information of our business by providing
       different metrics at account level (by id_deal).
       Additionally it provides Deal attributes.
+      Metrics displayed in the model range for the past 24 months. Also, churned 
+      accounts are available for historical values, until 3 months after the offboarding 
+      date.
+      Keep in mind that metrics that depend on the invoicing cycle are only available with 
+      a time delay. If you need timely information, at your own risk, check the equivalent 
+      intermediate model.
 
     data_tests:
       - dbt_utils.unique_combination_of_columns: