Merged PR 3896: S&P invoice model

# Description

New Invoice model for S&P
Quite a dense model, it needs to consider some different situations for the different Protection types, verification status and if the user has the `is_protected` flag active for it's bookings.
I leave the documentation for support to better clarify all the possible scenarios and a screenshot of how it is currently looking the model's result.
There are a couple of rename changes on other models, nothing big.
If there are any inquiries let me know.
https://www.notion.so/knowyourguest-superhog/Invoice-Screen-Protect-1610446ff9c980f88de6d6293b4fab03?pvs=4

![image.png](https://guardhog.visualstudio.com/4148d95f-4b6d-4205-bcff-e9c8e0d2ca65/_apis/git/repositories/54ac356f-aad7-46d2-b62c-e8c5b3bb8ebf/pullRequests/3896/attachments/image.png)

# 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: #25360

models/intermediate/core/schema.yml

@@ -4742,7 +4742,7 @@ models:
         data_tests:
           - not_null
 
-      - name: price_increase
+      - name: price_increase_percentage
         data_type: numeric
         description: The percentage or value of the price increase
           applied to the user's account.
@@ -4758,7 +4758,7 @@ models:
         data_tests:
           - is_first_day_of_month
 
-      - name: monthly_volume_discount
+      - name: monthly_volume_discount_percentage
         data_type: numeric
         description: The discount percentage or value offered based on the
           volume of bookings achieved within a month.
@@ -4769,7 +4769,7 @@ models:
               max_value: 100
               strictly: true
 
-      - name: threshold_approved_booking_volume
+      - name: threshold_approved_or_flagged_booking_volume
         data_type: numeric
         description: The minimum number of bookings required to qualify for
           the monthly volume discount.
@@ -4792,7 +4792,7 @@ models:
         data_tests:
           - is_last_day_of_month
 
-      - name: monthly_general_discount
+      - name: monthly_general_discount_percentage
         data_type: numeric
         description: The general discount percentage or value applied to all
           bookings within the applicable period.