Merged PR 2533: Guest Journey metrics per customer segmentation

# Description

Modifies `int_core__mtd_guest_journey_metrics` to include the customer segmentation based on listings. `schema.yaml` is also affected including new fields and tests. Hardcoded `int_core__mtd_vs_previous_year_metrics` to avoid propagating this upwards and messing up with the data display.

Overall, follows a similar strategy as we did for Booking metrics.

# 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: #19325

models/intermediate/cross/int_mtd_vs_previous_year_metrics.sql

@@ -11,6 +11,8 @@ with
     ),
     int_core__mtd_guest_journey_metrics as (
         select * from {{ ref("int_core__mtd_guest_journey_metrics") }}
+        -- TEMPORAL: FORCING DIMENSION = GLOBAL TO AVOID BREAKING CHANGES IN PRODUCTION
+        where dimension = 'global'
     ),
     int_core__mtd_accommodation_metrics as (
         select * from {{ ref("int_core__mtd_accommodation_metrics") }}