No longer possible to override core using `override_search_core`

After updating from 3.0.5 to 3.1.1 our search broke for a client that was sharing a common core between ACSF sites. We are overriding the core selection using the method documented in the module README by setting the `override_search_core` value in a settings.php. Since this broke our site and the approach still appears to be supported by the module I've set the priority to Major.

The code preventing the override from working correctly is a check that prevents overrides on Acquia environments https://git.drupalcode.org/project/acquia_search/-/blob/3.1.x/src/EventS...

  public function onGetPossibleCores(AcquiaPossibleCoresEvent $event) {
    // Never allow overridden settings on Acquia Cloud.
    if ($this->subscription->getProvider() === 'acquia_cloud') {
      return;
    }