Merged PR 3482: Adapts date dimension skeleton for Main KPIs

# Description

New model:
* int_kpis__agg_dates_main_kpis - Serves as the skeleton of dates and dimensions for Main KPIs. It's aggregated since it follows a similar aggregation strategy. It's a single model to feed both Main KPIs visualisations. Note boolean fields are real booleans (true/false) while before these were integers (1/0). This also affects downstream models.

Main KPIs flow adaptations to new skeleton model:
* int_monthly_aggregated_metrics_history_by_deal
* int_monthly_churn_metrics - additionally, calls usual KPIs macro instead of old one
* int_mtd_vs_previous_year_metrics

Reporting changes to ensure report is not down:
* mtd_aggregated_metrics - adaptations on booleans (true-1, false-0)

Cleaning:
* get_kpi_dimensions macro is no longer used
* int_dates_by_deal model and schema entry
* int_dates_mtd_by_dimension model and schema entry
* int_dates_mtd model and schema entry

# 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: #23763

models/intermediate/kpis/schema.yml

@@ -41,14 +41,14 @@ models:
       - name: first_day_month
         data_type: date
         description: |
-          First day of the month correspoding to the date field.
+          First day of the month corresponding to the date field.
         tests:
           - not_null
 
       - name: last_day_month
         data_type: date
         description: |
-          Last day of the month correspoding to the date field.
+          Last day of the month corresponding to the date field.
         tests:
           - not_null
 
@@ -103,6 +103,91 @@ models:
         tests:
           - not_null
 
+  - name: int_kpis__agg_dates_main_kpis
+    description: |
+      This model provides the skeleton of dates and dimensions needed for Main KPIs display.
+      It encapsulates the multiple manners to present data in the reporting, namely, Monthly+MTD 
+      per a given dimension or specifically Monthly by Deal. 
+      The rest of the metrics computed are attached to this master table.
+
+    tests:
+      - dbt_utils.unique_combination_of_columns:
+          combination_of_columns:
+            - date
+            - dimension
+            - dimension_value
+
+    columns:
+      - name: date
+        data_type: date
+        description: |
+          The end date of the time range considered for the metrics that will be 
+          available in this record.
+        tests:
+          - not_null
+
+      - name: dimension
+        data_type: string
+        description: The dimension or granularity of the metrics.
+        tests:
+          - accepted_values:
+              values:
+                - global
+                - by_number_of_listings
+                - by_billing_country
+                - by_deal
+
+      - name: dimension_value
+        data_type: string
+        description: The value or segment available for the selected dimension.
+        tests:
+          - not_null
+
+      - name: year
+        data_type: int
+        description: Year number of the given date.
+        tests:
+          - not_null
+
+      - name: month
+        data_type: int
+        description: Month number of the given date.
+        tests:
+          - not_null
+
+      - name: day
+        data_type: int
+        description: Day monthly number of the given date.
+        tests:
+          - not_null
+
+      - name: first_day_month
+        data_type: date
+        description: |
+          First day of the month corresponding to the date field.
+        tests:
+          - not_null
+
+      - name: last_day_month
+        data_type: date
+        description: |
+          Last day of the month corresponding to the date field.
+        tests:
+          - not_null
+
+      - name: is_end_of_month
+        data_type: boolean
+        description: True if it's end of month, false otherwise.
+        tests:
+          - not_null
+
+      - name: is_current_month
+        data_type: boolean
+        description: |
+          True if the date is within the current month, false otherwise.
+        tests:
+          - not_null
+
   - name: int_kpis__lifecycle_daily_accommodation
     description: |
       This model computes the daily lifecycle segment for each accommodation, also known as