Decompress files for update_test_new_module

The only place the zip is actually referenced is here:

/**
   * Data provider method for testViaAuthorize().
   *
   * Each of these release URLs has been cached in the setUp() method.
   */
  public static function archiveFileUrlProvider() {
    return [
      'tar.gz' => [
        'url' => 'https://ftp.drupal.org/files/projects/update_test_new_module.tar.gz',
      ],
      'zip' => [
        'url' => 'https://ftp.drupal.org/files/projects/update_test_new_module.zip',
      ],
    ];
  }

I wonder if we can just move these to a contrib module if they are being referenced on d.o anyway.

The tar is referenced above but also in these two places:

$validArchiveFile = __DIR__ . '/../../update_test_new_module/8.x-1.0/update_test_new_module.tar.gz';
    $edit = [
      'files[project_upload]' => $validArchiveFile,
    ];
    $this->drupalGet('admin/modules/install');
    $this->submitForm($edit, 'Continue');

 <release>
  <name>update_test_new_module 8.x-1.1</name>
  <version>8.x-1.1</version>
  <status>published</status>
  <release_link>http://example.com/update_test_new_module-8-x-1-1-release</release_link>
  <download_link>core/modules/update/tests/update_test_new_module/8.x-1.1/update_test_new_module.tar.gz</download_link>
  <date>1300424521</date>
  <terms>
   <term><name>Release type</name><value>New features</value></term>
   <term><name>Release type</name><value>Bug fixes</value></term>
  </terms>
 </release>