Merged PR 3810: Adds is_end_of_month_or_yesterday for Main KPIs

# Description

Adds `is_end_of_month_or_yesterday` for Main KPIs.
Apparently, the fact that we do not show the ongoing value of the month on some tabs of Main KPIs is the main blocker for Ben C to consistently use Main KPIs, which he actually retrieves from the SH legacy reporting. Since I'm sceptical about the data shown there, I want to remove this blocker.
It will require a small PR on PBI as well.

# 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.
- [NA] 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: #25342

models/reporting/general/mtd_aggregated_metrics.sql

@@ -26,6 +26,9 @@ select
     day as day,
     case when is_end_of_month then 1 else 0 end as is_end_of_month,
     case when is_current_month then 1 else 0 end as is_current_month,
+    case
+        when is_end_of_month_or_yesterday then 1 else 0
+    end as is_end_of_month_or_yesterday,
     first_day_month as first_day_month,
     date as date,
     dimension_display as dimension,