Revert "Rename all test files from JS -> ES6"

This reverts commit 2abe85b8344de1102c1589a9ac9421a8b296f2b5.

test/javascripts/acceptance/reports-test.js

@@ -1,35 +0,0 @@
-import { acceptance } from "helpers/qunit-helpers";
-
-acceptance("Reports", {
-  loggedIn: true
-});
-
-QUnit.test("Visit reports page", async assert => {
-  await visit("/admin/reports");
-
-  assert.equal($(".reports-list .report").length, 1);
-
-  const $report = $(".reports-list .report:first-child");
-
-  assert.equal(
-    $report
-      .find(".report-title")
-      .html()
-      .trim(),
-    "My report"
-  );
-
-  assert.equal(
-    $report
-      .find(".report-description")
-      .html()
-      .trim(),
-    "List of my activities"
-  );
-});
-
-QUnit.test("Visit report page", async assert => {
-  await visit("/admin/reports/staff_logins");
-
-  assert.ok(exists(".export-csv-btn"));
-});