Fix ActionController::UnknownFormat on download actions

[Paul-Bob]

Describe the bug

When early returning an error or something on an action that have self.may_download_file = true an ActionController::UnknownFormat error is raised.

Action code:

class Avo::Actions::ExportCsv < Avo::BaseAction
  self.name = "Export csv"
  self.no_confirmation = false
  self.may_download_file = true

  def handle(**args)
    return error "Error"
  end
end

[Paul-Bob]

From here

[adrianthedev]

I spoke with Marco about this. He didn't run into this before but he has the same recommendation as you do. Use that package.
But I would move that JS code from the controller to a custom stimulus method.

cc @Paul-Bob