Merged PR 2459: duplicated_bookings modification

# Description

I modified the model of duplicated_bookings, I saw it had some errors and data that was not being used

# 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: #18875

models/intermediate/core/schema.yaml

@@ -19,6 +19,9 @@ models:
       - name: id_booking
         data_type: bigint
         description: The unique, Superhog generated id for this booking.
+        tests:
+          - unique
+          - not_null
 
       - name: is_duplicate_booking
         data_type: boolean
@@ -39,6 +42,8 @@ models:
           original and the others are the duplicates:
             - B and C will appear in this table, A will not.
             - The value of this field for both B and C will be A's id.
+        tests:
+          - not_null
   
   - name: int_core__booking_charge_events
     description: |
@@ -1377,7 +1382,7 @@ models:
           accomodation and check-in date, the oldest one will have False as a value in this field,
           and the other ones will have True as a value in this Failed."
 
-          Put simply, if you don't want to receive duplicates, filter this field to True.
+          Put simply, if you don't want to receive duplicates, filter this field to False.
 
       - name: is_duplicating_booking_with_id
         data_type: bigint