Merged PR 4649: Updated exposures

# Description

_Describe your motivation and changes here._

# Checklist

- [x] The edited models and dependants run properly with production data.
- [ ] The edited models are sufficiently documented.
- [ ] The edited models contain PK tests, and I've ran and passed them.
- [ ] I have checked for DRY opportunities with other models and docs.
- [ ] I've picked the right materialization for the affected models.

# Other

- [ ] Check if a full-refresh is required after this PR is merged.

Updated exposures

Related work items: #28190

models/reporting/exposures.yml

@@ -515,3 +515,20 @@ exposures:
     owner:
       name: Joaquin Ossa
       email: joaquin.ossa@superhog.com
+
+  - name: account_managers_churn_report
+    label: Churn Report
+    type: dashboard
+    maturity: medium
+    url: https://app.powerbi.com/groups/me/apps/bb1a782f-cccc-4427-ab1a-efc207d49b62/reports/d4955aad-1550-46c7-9549-2bdeebb99286/ReportSectionddc493aece54c925670a?ctid=862842df-2998-4826-bea9-b726bc01d3a7&experience=power-bi
+    description: |
+      A Power BI report displaying data on churned deals in Superhog. 
+      It provides detailed information on all accounts that have churned, 
+      including their performance, offboarding details, and account managers.
+
+    depends_on:
+      - ref('monthly_aggregated_metrics_history_by_deal_by_time_window')
+
+    owner:
+      name: Joaquin Ossa
+      email: joaquin.ossa@superhog.com