Merged PR 4102: Athena price update

# Description

This PR handles the new price set for Athena in Nov.24, as indicated by Nila from Finance (see more detailes in linked story). Price has gone from 2.0GBP to 2.1GBP.

Note that I have manually checked the correctness of the figures, I'm highly confident on the quality of the PR. All figures stay the same in old and new version of to the cutoff date (`2024-11-01T00:00:00Z`). Then, after that date, the 10 cents extra show appropiately.

# 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: #26475

seeds/schema.yml

@@ -152,3 +152,25 @@ seeds:
         description: |
           How much Superhog decided to pay out to the partner as part of this 
           claim, defined in the settlement currency.
+
+  - name: stg_seed__athena_price_history
+    description: |
+      A price history for the Athena fee per night.
+
+      Yes, I know. It's terrible that we keep this here. Oh boy, how I wish it 
+      wasn't like this!
+
+    columns:
+      - name: start_at_utc
+        data_type: timestamp
+        description: |
+          The start of the time range where this record is applicable.
+
+      - name: end_at_utc
+        data_type: timestamp
+        description: The end of the time range where this record is applicable.
+
+      - name: fee_per_night_gbp
+        data_type: numeric
+        description: |
+          How much we charge per night in this time range.

seeds/stg_seed__athena_price_history.csv

@@ -0,0 +1,3 @@
+start_at_utc,end_at_utc,fee_per_night_gbp
+2020-01-01T00:00:00Z,2024-11-01T00:00:00Z,2.0
+2024-11-01T00:00:00Z,2099-12-31T00:00:00Z,2.1