Merged PR 3825: Removing Booking fields soon to be dropped

# Description

Following a communication from Gus, the following fields in Booking table are going to be removed:
* StagingHostBookingId
* AdditionalGuests

This PR aims to remove DWH dependencies.

# Checklist

- [X] The edited models and dependants run properly with production data.
- [NA] The edited models are sufficiently documented.
- [X] The edited models contain PK tests, and I've ran and passed them.
- [NA] I have checked for DRY opportunities with other models and docs.
- [NA] I've picked the right materialization for the affected models.

# Other

- [X] Check if a full-refresh is required after this PR is merged. **Yes, Booking table in staging is incremental**

Related work items: #25405

models/intermediate/core/int_core__bookings.sql

@@ -25,7 +25,6 @@ select
     b.id_booking_source,
     b.id_verification_request,
     vrbs.verification_request_booking_source,
-    b.id_staging_host_booking,
     coalesce(db.is_duplicate_booking, false) as is_duplicate_booking,
     db.is_duplicating_booking_with_id,
     bs.booking_state,
@@ -43,7 +42,6 @@ select
     b.guest_last_name,
     b.guest_first_name,
     b.guest_telephone,
-    b.additional_guests,
     b.unsubscribe_verification_reminder,
     b.created_at_utc,
     b.created_date_utc,

models/intermediate/core/schema.yml

@@ -1367,10 +1367,6 @@ models:
                 - "OSL"
                 - "API/MANUAL"
 
-      - name: id_staging_host_booking
-        data_type: bigint
-        description: ""
-
       - name: is_duplicate_booking
         data_type: boolean
         description: A flag that identifies whether the booking is a duplicate.
@@ -1450,10 +1446,6 @@ models:
         data_type: character varying
         description: ""
 
-      - name: additional_guests
-        data_type: character varying
-        description: ""
-
       - name: unsubscribe_verification_reminder
         data_type: boolean
         description: ""

models/staging/core/stg_core__booking.sql

@@ -23,7 +23,6 @@ with
             {{ adapter.quote("BookingSourceId") }} as id_booking_source,
             {{ adapter.quote("VerificationRequestId") }} as id_verification_request,
             {{ adapter.quote("BookingStateId") }} as id_booking_state,
-            {{ adapter.quote("StagingHostBookingId") }} as id_staging_host_booking,
             {{ adapter.quote("CheckIn") }} as check_in_at_utc,
             cast({{ adapter.quote("CheckIn") }} as date) as check_in_date_utc,
             {{ adapter.quote("CheckOut") }} as check_out_at_utc,
@@ -33,7 +32,6 @@ with
             {{ adapter.quote("GuestLastName") }} as guest_last_name,
             {{ adapter.quote("GuestFirstName") }} as guest_first_name,
             {{ adapter.quote("GuestTelephone") }} as guest_telephone,
-            {{ adapter.quote("AdditionalGuests") }} as additional_guests,
             {{ adapter.quote("UnsubscribeVerificationReminder") }}
             as unsubscribe_verification_reminder,
             {{ adapter.quote("CreatedDate") }} as created_at_utc,