Rename app-testing-tools class to app-testing-tools__inset for consistency in styling

app/components/create_log_actions_component.html.erb

@@ -9,7 +9,7 @@
     <% end %>
 
     <% if FeatureToggle.create_test_logs_enabled? %>
-      <div class="govuk-inset-text app-testing-tools">
+      <div class="govuk-inset-text app-testing-tools__inset">
         <span class="govuk-tag app-testing-tools__tag">Testing tools</span>
         <span class="govuk-body govuk-body-s">These options can only be seen and used in testing environments.</span>
         <div>

app/frontend/styles/_testing-tools.scss

@@ -1,4 +1,4 @@
-.app-testing-tools {
+.app-testing-tools__inset {
   border-left-color: #f47738;
   margin-bottom: 0;
   margin-top: 0;