Fix failing to export after introducing Turbo Drive

Refs. #3461 (comment)

app/views/rails_admin/main/export.html.erb

@@ -1,6 +1,6 @@
 <% params = request.params.except(:action, :controller, :utf8, :page, :per_page, :format, :authenticity_token) %>
 <% visible_fields = @model_config.export.with(view: self, object: @abstract_model.model.new, controller: self.controller).visible_fields %>
-<%= form_tag export_path(params.merge(all: true)), method: 'post', class: "main" do %>
+<%= form_tag export_path(params.merge(all: true)), method: 'post', class: "main", data: {turbo: false} do %>
   <input name="send_data" type="hidden" value="true" />
   <fieldset id="fields_to_export" class="mb-3">
     <legend>

spec/integration/actions/export_spec.rb

@@ -80,6 +80,12 @@
     is_expected.to have_content @player.team.name
   end
 
+  it 'works with Turbo Drive enabled', js: true do
+    visit export_path(model_name: 'player')
+    page.execute_script 'console.error = function(error) { throw error }'
+    expect { find_button('Export to csv').trigger('click') }.not_to raise_error
+  end
+
   it 'exports polymorphic fields the easy way for now' do
     visit export_path(model_name: 'comment')
     select "<comma> ','", from: 'csv_options_generator_col_sep'