Skip paperclip spoof detector unless opted into attachment processing specs (#31454)

spec/rails_helper.rb

@@ -147,7 +147,10 @@ RSpec.configure do |config|
 
   config.before do |example|
     unless example.metadata[:attachment_processing]
-      allow_any_instance_of(Paperclip::Attachment).to receive(:post_process).and_return(true) # rubocop:disable RSpec/AnyInstance
+      # rubocop:disable RSpec/AnyInstance
+      allow_any_instance_of(Paperclip::Attachment).to receive(:post_process).and_return(true)
+      allow_any_instance_of(Paperclip::MediaTypeSpoofDetector).to receive(:spoofed?).and_return(false)
+      # rubocop:enable RSpec/AnyInstance
     end
   end