docs: delete zombie Learn pages + add Log Analytics connector

Delete pages whose docs-v2 equivalents were already removed:
- managed-identity-ado-repos.md (covered in ADO connector page)
- configuration-deletion.md (basic UI action, not a capability)

Add new Learn page:
- log-analytics-app-insights.md (matches docs-v2 PR #6414)

Update toc.yml: remove zombie entries, add Log Analytics entry.

Author: dm-chelupati

articles/sre-agent/configuration-deletion.md

@@ -80,6 +80,6 @@ The agent queries your `SigninLogs` table via KQL, finds a pattern of failed MFA
 
 ## Related content
 
-- [Azure Data Explorer connector](kusto-connector.md)
-- [Log Analytics and Application Insights](log-analytics-app-insights.md)
+- [Azure Data Explorer connector](adx-cluster-grouping.md)
+- [Set up a Log Analytics connector](setup-log-analytics-connector.md)
 - [Diagnose Azure observability issues](diagnose-azure-observability.md)

articles/sre-agent/log-analytics-app-insights.md

@@ -62,10 +62,6 @@ items:
             href: ado-connector.md
           - name: Cross-account ADO access
             href: cross-account-ado-oauth.md
-          - name: Managed identity for ADO repos
-            href: managed-identity-ado-repos.md
-          - name: Remove resources from scope
-            href: configuration-deletion.md
       - name: Diagnose
         items:
           - name: Incident response