Package Manager should warn, not error, about being enabled for early testing

Problem/Motivation

After installing Drupal 11.3 via CMS 2, admin/reports/status reports this error:

Errors Found: Package Manager
Package Manager is available for early testing. To install the module set the value of 'testing_package_manager' to TRUE in your settings.php file

So the error assumes that the package manager module has not been installed, but actually it has been installed by a Drupal CMS recipe.

The term "error" is misleading because it might cause the Drupal user to worry that something has gone wrong with the installation.

core/modules/package_manager/src/Hook/PackageManagerRequirementsHooks.php :

if (Settings::get('testing_package_manager', FALSE) === FALSE) {
$requirements['testing_package_manager'] = [
 'title' => $this->t('Package Manager'),
'value' => $this->t('Not protected'),
'description' => $this->t("Package Manager is available for early testing. To install the
     module set the value of 'testing_package_manager' to TRUE in your settings.php file."),
'severity' => REQUIREMENT_ERROR,
  ];
 }

Steps to reproduce

Install CMS 2, go to admin/reports/status

Proposed resolutions

• check whether package_manager module is enabled before triggering this error
• change the error description
• downgrade severity from REQUIREMENT_ERROR to REQUIREMENT_WARNING