chore: skip dd rum if on landing page and add version (#1218)

## Problem
Cloudflare worker for datadog RUM proxy have been close to hitting
limits recently.

## Solution
Do not send if user is not authenticated: the only pages accessible will
be landing page, use cases, and Tiles read-only page.

## Other changes
* Add app version

Author: kevinkim-ogp

packages/frontend/src/index.tsx

@@ -36,6 +36,11 @@ if (['prod', 'staging'].includes(appConfig.env)) {
     trackResources: true,
     trackLongTasks: true,
     defaultPrivacyLevel: 'mask-user-input',
+    version: appConfig.version,
+    beforeSend: (event) => {
+      // do not send if user is anonymous
+      return event.usr !== undefined
+    },
   })
 }
 root.render(