feat: update controller and rename view

app/views/schemes/schemes_csv_confirmation.html.erb

@@ -1,15 +0,0 @@
-<% content_for :title, "We’re sending you an email" %>
-<div class="govuk-grid-row">
-  <div class="govuk-grid-column-two-thirds">
-    <%= govuk_panel(title_text: "We’re sending you an email") %>
-
-    <p class="govuk-body">It should arrive in a few minutes, but it could take longer.</p>
-
-    <h2 class="govuk-heading-m">What happens next</h2>
-    <p class="govuk-body">Open your email inbox and click the link to download your CSV file.</p>
-
-    <p class="govuk-body">
-      <%= govuk_link_to "Return to logs", schemes_path %>
-    </p>
-  </div>
-</div>