Merged PR 2469: Included the exchange rate to GBP in the model

# Description

Included the exchange rate to GBP in the model instead of joining the data inside the PBI report, for both understanding and easier joining

# 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

- [X] Check if a full-refresh is required after this PR is merged.

Included the exchange rate to GBP in the model

Related work items: #18875

models/intermediate/core/int_core__host_booking_fees.sql

@@ -7,7 +7,8 @@ with
     int_core__duplicate_bookings as (
         select * from {{ ref("int_core__duplicate_bookings") }}
     ),
-    int_core__unified_user as (select * from {{ ref("int_core__unified_user") }})
+    int_core__unified_user as (select * from {{ ref("int_core__unified_user") }}),
+    int_simple_exchange_rates as (select * from {{ ref("int_simple_exchange_rates") }})
 select
     b.id_booking,
     b.id_user_guest,
@@ -17,14 +18,22 @@ select
     coalesce(db.is_duplicate_booking, false) as is_duplicate_booking,
     bce.booking_fee_local,
     uu.account_currency_iso4217,
+    coalesce(
+        ser.rate * bce.booking_fee_local, bce.booking_fee_local
+    ) as booking_fee_in_gbp,
     bce.booking_fee_charge_at_utc,
     bce.booking_fee_charge_date_utc
 from stg_core__booking b
 left join int_core__booking_charge_events bce on b.id_booking = bce.id_booking
 left join stg_core__booking_state bs on b.id_booking_state = bs.id_booking_state
 left join int_core__duplicate_bookings db on b.id_booking = db.id_booking
+left join int_core__unified_user uu on lower(b.id_user_host) = lower(uu.id_user)
+-- We user 'lower' because the id_user_host can be found in capital letters or not
+-- depending on the table and Postgres is case sensitive
 left join
-    int_core__unified_user uu on lower(b.id_user_host) = lower(uu.id_user)
-    -- We user 'lower' because the id_user_host can be found in capital letters or not
-    -- depending on the table and Postgres is case sensitive
-    
+    int_simple_exchange_rates ser
+    on (
+        ser.from_currency = uu.account_currency_iso4217
+        and ser.rate_date_utc = bce.booking_fee_charge_date_utc
+        and ser.to_currency = 'GBP'
+    )

models/intermediate/core/schema.yaml

@@ -1643,6 +1643,10 @@ models:
         data_type: character varying
         description: "Currency used by host/pm/platform users."
 
+      - name: booking_fee_in_gbp
+        data_type: numeric
+        description: "The fee to apply to the booking, in GBP"
+
       - name: booking_fee_charge_at_utc
         data_type: timestamp without time zone
         description: |

models/reporting/core/core__host_booking_fees.sql

@@ -11,6 +11,7 @@ select
     is_duplicate_booking as is_duplicate_booking,
     booking_fee_local as booking_fee_local,
     account_currency_iso4217 as account_currency_iso4217,
+    booking_fee_in_gbp as booking_fee_in_gbp,
     booking_fee_charge_at_utc as booking_fee_charge_at_utc,
     booking_fee_charge_date_utc as booking_fee_charge_date_utc
 from int_core__host_booking_fees

models/reporting/core/schema.yaml

@@ -1045,6 +1045,10 @@ models:
         data_type: character varying
         description: "Currency used by host/pm/platform users."
 
+      - name: booking_fee_in_gbp
+        data_type: numeric
+        description: "The fee to apply to the booking, in GBP"
+
       - name: booking_fee_charge_at_utc
         data_type: timestamp without time zone
         description: |