Update content related to virus deletions

This updates the content to be clearer why the file was deleted to
hopefully reduce the number of questions about it.

app/components/check_your_answers_summary/component.rb

@@ -138,7 +138,7 @@ def format_document(document, field)
         [
           format_array(uploads, field),
           if malware_scan_active && scope.scan_result_suspect.exists?
-            "<em>One or more upload has been deleted by the virus scanner.</em>"
+            "<em>#{scope.count} #{"file upload".pluralize(scope.count)} has been scanned as malware and deleted.</em>"
           elsif request.path.starts_with?("/assessor") &&
                 convert_to_pdf_active && !uploads.all?(&:is_pdf?)
             helpers.govuk_link_to(

spec/components/check_your_answers_summary_component_spec.rb

@@ -286,7 +286,7 @@
 
       it "includes a warning" do
         expect(row.at_css(".govuk-summary-list__value").text).to include(
-          "One or more upload has been deleted by the virus scanner",
+          "2 file uploads has been scanned as malware and deleted.",
         )
       end
     end