Add owner field to Event Management manifest files (DataDog#21010)

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-authored-by: Claude <noreply@anthropic.com>

Author: davidfeng-datadog

solarwinds/manifest.json

@@ -2,6 +2,7 @@
   "manifest_version": "2.0.0",
   "app_uuid": "b9c52007-5909-44c7-b4a2-624f0efffa9e",
   "app_id": "solarwinds",
+  "owner": "event-management",
   "display_on_public_website": false,
   "tile": {
     "overview": "README.md#Overview",