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

This reverts commit 2abe85b8344de1102c1589a9ac9421a8b296f2b5.

test/javascripts/widgets/actions-summary-test.js

@@ -1,24 +0,0 @@
-import { moduleForWidget, widgetTest } from "helpers/widget-test";
-
-moduleForWidget("actions-summary");
-
-widgetTest("post deleted", {
-  template: '{{mount-widget widget="actions-summary" args=args}}',
-  beforeEach() {
-    this.set("args", {
-      deleted_at: "2016-01-01",
-      deletedByUsername: "eviltrout",
-      deletedByAvatarTemplate: "/images/avatar.png"
-    });
-  },
-  test(assert) {
-    assert.ok(
-      find(".post-action .d-icon-far-trash-alt").length === 1,
-      "it has the deleted icon"
-    );
-    assert.ok(
-      find(".avatar[title=eviltrout]").length === 1,
-      "it has the deleted by avatar"
-    );
-  }
-});