Merged PR 3605: Beautification of Reporting String values

# Description

Creates a macro for beautification of categorical values.

# 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: #20809

models/reporting/kpis/kpis__product_new_dash_agg_metrics.sql

@@ -4,9 +4,9 @@ with
     )
 select
     date as date,
-    time_granularity as time_granularity,
-    dimension as dimension,
-    dimension_value as dimension_value,
+    {{ capitalise_and_remove_underscores("time_granularity") }} as time_granularity,
+    {{ capitalise_and_remove_underscores("dimension") }} as dimension,
+    {{ capitalise_and_remove_underscores("dimension_value") }} as dimension_value,
     created_services as created_services,
     booking_with_created_services_count as booking_with_created_services_count
 from int_kpis__product_new_dash_agg_metrics

models/reporting/kpis/schema.yml

@@ -233,8 +233,8 @@ models:
         tests:
           - accepted_values:
               values:
-                - daily
-                - monthly
+                - Daily
+                - Monthly
 
       - name: dimension
         data_type: string
@@ -242,14 +242,14 @@ models:
         tests:
           - accepted_values:
               values:
-                - global
-                - by_number_of_listings
-                - by_billing_country
-                - by_deal
-                - by_new_dash_version
-                - by_has_upgraded_service
-                - by_service
-                - by_host
+                - "Global"
+                - "By Number Of Listings"
+                - "By Billing Country"
+                - "By Deal"
+                - "By New Dash Version"
+                - "By Has Upgraded Service"
+                - "By Service"
+                - "By Host"
 
       - name: dimension_value
         data_type: string