Fix Logic App template: update triggerBody to data.context for Azure …

[its-abhaykumar]

Fix Logic App Slack template: update triggerBody to data.context for Azure Monitor alerts

Fixes #14225

Problem

The current Logic App template for posting Azure Monitor alerts to Slack assumes that alert payloads are structured with triggerBody()['context'].

Azure Monitor now sends alert details under data.context following the Common Alert Schema. As a result, Slack messages were missing key alert information or failing.

Solution

• Updated all references in the template from triggerBody()['context'] → triggerBody()['data']['context']
• Updated both the URL shortener HTTP action and Slack post message action
• No breaking changes to existing ARM template structure

Testing

• Deployed template in a test resource group
• Sent a sample Azure Monitor payload:

{
  "status": "Activated",
  "data": {
    "context": {
      "name": "Test Alert",
      "portalLink": "https://portal.azure.com/#resource/test",
      "resourceName": "MyResource"
    }
  }
}

[alex-frankel]

Thanks for your contribution. We're closing stale PRs (no updates in 90+ days) as we transition to the new CI process — see #14715 for the new submission requirements. If you'd like to continue with this change, please rebase against master, ensure the new testResult block is populated in metadata.json, and reopen this PR or submit a fresh one.