Add owner field to SaaS Integrations manifest files (DataDog#21672)

Adds 'owner': 'saas-integrations' field to 3 integration manifest.json files for IDP-800.

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

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

Author: davidfeng-datadog

anthropic_usage_and_costs/manifest.json

@@ -2,6 +2,7 @@
   "manifest_version": "2.0.0",
   "app_uuid": "96f960de-2b87-41ec-8d9a-88fe75e93dc9",
   "app_id": "anthropic-usage-and-costs",
+  "owner": "saas-integrations",
   "display_on_public_website": true,
   "tile": {
     "overview": "README.md#Overview",

jamf_pro/manifest.json

@@ -2,6 +2,7 @@
   "manifest_version": "2.0.0",
   "app_uuid": "02ca0a87-f9e7-46e3-989d-9ac8b3654ac4",
   "app_id": "jamf-pro",
+  "owner": "saas-integrations",
   "display_on_public_website": true,
   "tile": {
     "overview": "README.md#Overview",

trend_micro_cloud_one/manifest.json

@@ -2,6 +2,7 @@
   "manifest_version": "2.0.0",
   "app_uuid": "06b13f44-cba3-48f1-8c73-338f22b9ad18",
   "app_id": "trend-micro-cloud-one",
+  "owner": "saas-integrations",
   "display_on_public_website": false,
   "tile": {
     "overview": "README.md#Overview",