FEATURE: Add API scope for /logs route (#24956)

Adds an API scope for accessing Logster's routes. This one is a bit
different than routes from core because it is mounted like

```
mount Logster::Web => "/logs"
```

and doesn't have all the route info a traditional rails app/engine does.

spec/requests/admin/api_controller_spec.rb

@@ -440,6 +440,7 @@ RSpec.describe Admin::ApiController do
           "search",
           "invites",
           "wordpress",
+          "logs",
         )
 
         topic_routes = [
@@ -479,6 +480,10 @@ RSpec.describe Admin::ApiController do
           "/u/:username/feature-topic (PUT)",
           "/u/:username/clear-featured-topic (PUT)",
         )
+
+        expect(
+          scopes["logs"].any? { |h| h["urls"].include?("/logs/messages.json (POST)") },
+        ).to be_truthy
       end
     end