Warn batch upload is not compatible with flex

Batch upload and valkyrized works are incompatible. We will add help text to warn the user of this case: #7185

Author: ShanaLMoore

config/features.rb

@@ -33,6 +33,10 @@
             default: Hyrax.config.active_deposit_agreement_acceptance?,
             description: "Require an active acceptance of the deposit agreement by checking a checkbox"
 
+    feature :batch_upload,
+            default: false,
+            description: "Enable uploading batches of works. <br /><strong>WARNING:</strong> This feature is not compatible with flexible metadata.".html_safe
+
     # Note, if this is deactivated, a default admin set will be created and all
     # works will be assigned to it when they are created.
     feature :assign_admin_set,