Fix ReactOnRailsPro::Utils constant loading issue

Add guard to check if ReactOnRailsPro::Utils is defined before calling it.
Add rescue block to handle NameError and LoadError gracefully.

This fixes the issue where tests fail with 'uninitialized constant ReactOnRailsPro::Utils'
when the Pro gem is available but not fully loaded yet.

Fixes failing test: ReactOnRails::Configuration changes the configuration of the gem

Author: justin808

lib/react_on_rails/utils.rb

@@ -261,7 +261,11 @@ def self.react_on_rails_pro?
 
         # Guard against edge cases where constant exists but module isn't fully loaded
         require "react_on_rails_pro" unless defined?(ReactOnRailsPro)
+        return false unless defined?(ReactOnRailsPro::Utils)
+
         ReactOnRailsPro::Utils.validated_license_data!.present?
+      rescue NameError, LoadError
+        false
       end
     end