Add Back button to policy simulation page for non-explorer

Fixes https://bugzilla.redhat.com/show_bug.cgi?id=1704395

app/controllers/application_controller/policy_support.rb

@@ -98,6 +98,8 @@ def policy_sim(records = [])
         @refresh_partial = "layouts/policy_sim"
         replace_right_cell(:refresh_breadcrumbs => false)
       end
+    else
+      session[:edit] = @edit
     end
   end
 

app/views/vm_common/_policies.html.haml

@@ -12,3 +12,12 @@
 
   = _('* Items in <font color="red"><i>red italics</i></font> do not change the outcome of the scope or expression.').html_safe
 
+- unless @explorer
+  #buttons{:align => 'right'}
+    -# Go back to policy simulation screen
+    = link_to(_('Back'),
+              {:action => 'policy_sim', :continue => true, :controller => 'vm'},
+               :class  => 'btn btn-default',
+               :alt    => t = _('Back'),
+               :title  => t,
+               :method => :post)

spec/views/vm_common/_policies.html.haml_spec.rb

@@ -0,0 +1,13 @@
+describe 'vm_common/_policies.html.haml' do
+  before do
+    assign(:policy_options, :out_of_scope => true, :passed => true, :failed => true)
+    assign(:policy_simulation_tree, TreeBuilderPolicySimulation.new(:policy_simulation_tree, {}, true))
+    assign(:record, FactoryBot.create(:vm_infra))
+    set_controller_for_view('vm_or_template')
+  end
+
+  it 'renders Back button for non explorer screens' do
+    render :partial => 'vm_common/policies'
+    expect(response).to include('<a class="btn btn-default" alt="Back" title="Back" rel="nofollow" data-method="post" href="/vm/policy_sim?continue=true">Back</a>')
+  end
+end