Reviewed adding IP recording to activity & audit log

Review of #2936

- Added testing to cover
- Added APP_PROXIES to .env.example.complete with details.
- Renamed migration to better align the name and to set the migration
  date to fit with production deploy order.
- Removed index from IP column in migration since an index does not yet
  provide any value.
- Updated table header text label.
- Prevented IP recording when in demo mode.

app/Actions/ActivityService.php

@@ -56,10 +56,11 @@ class ActivityService
      */
     protected function newActivityForUser(string $type): Activity
     {
+        $ip = request()->ip() ?? '';
         return $this->activity->newInstance()->forceFill([
             'type'     => strtolower($type),
             'user_id'  => user()->id,
-            'ip'       => Request::ip(),
+            'ip'       => config('app.env') === 'demo' ? '127.0.0.1' : $ip,
         ]);
     }