feat(xtm-platform-trial): activate feature flag XTM_PLATFORM_TRIAL (#3297) (#3405)

Signed-off-by: Julien Gérard <julien.gerard@filigran.io>

Author: Julienger0

apps/backend/config/default.json

@@ -20,7 +20,7 @@
     "pending_user_digest": false,
     "public_roadmap_monthly_reminder": false
   },
-  "enabled_features": [],
+  "enabled_features": ["XTM_PLATFORM_TRIAL"],
   "auth0": {
     "domain": "filigran.eu.auth0.com",
     "clientId": "changeme",