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/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: ""