Remove disabled email attachment specs

These were disabled a year ago in commit d57130d, which adds other
tests for the behaviour of attachments. These specs are no longer needed
nor useful.

spec/integration/outlook_email_delivery_spec.rb

@@ -141,51 +141,4 @@
       end
     end
   end
-
-  xdescribe "attached files" do
-    def as_adu(ffu)
-      ActionDispatch::Http::UploadedFile.new(tempfile: ffu.tempfile, filename: ffu.original_filename, type: ffu.content_type)
-    end
-
-    describe "uploaded by the user" do
-      let(:file_attachments) { [as_adu(fixture_file_upload(Rails.root.join("spec/fixtures/support/text-file.txt"), "text/plain"))] }
-
-      it "appear in the list of attachments" do
-        expect(draft_email.attachments.count).to eq(1)
-        expect(draft_email.attachments.first.content_type).to eq("text/plain")
-        expect(draft_email.attachments.first.name).to eq("text-file.txt")
-        expect(draft_email.attachments.first.content_bytes).to eq(Base64.encode64(file_attachments.first.tap(&:rewind).read))
-      end
-
-      context "when the file is infected" do
-        before { allow(Support::VirusScanner).to receive(:uploaded_file_safe?).and_return(false) }
-
-        it "makes the email invalid" do
-          expect(draft_email).not_to be_valid
-          expect(draft_email.errors[:file_attachments]).to include("One or more of the files you uploaded contained a virus")
-        end
-      end
-
-      context "when the file type is not accepted" do
-        let(:file_attachments) { [as_adu(fixture_file_upload(Rails.root.join("spec/fixtures/support/bad.php"), "application/x-httpd-php"))] }
-
-        it "makes the email invalid" do
-          expect(draft_email).not_to be_valid
-          expect(draft_email.errors[:file_attachments]).to include("One or more of the files you uploaded was an incorrect file type")
-        end
-      end
-    end
-
-    describe "coming from the email template" do
-      let(:template_attachment) { create(:support_email_template_attachment) }
-      let(:blob_attachments) { "[{\"file_id\": \"#{template_attachment.id}\", \"type\": \"Support::EmailTemplateAttachment\"}]" }
-
-      it "appear in the list of attachments" do
-        expect(draft_email.attachments.count).to eq(1)
-        expect(draft_email.attachments.first.content_type).to eq("text/plain")
-        expect(draft_email.attachments.first.name).to eq("attachment.txt")
-        expect(draft_email.attachments.first.content_bytes).to eq(Base64.encode64(template_attachment.file.download))
-      end
-    end
-  end
 end