fix: #3638000 dr cache:rebuild, --url and DRUPAL_URI do not select the site in a multisite

Moshe Weitzmanrequested to merge
issue/drupal-3638000:3638000-dr-site-selection into main

Closes #3638000

  • dr cache:rebuild uses the application's URI and DRUPAL_DEV_SITE_PATH, like commands that bootstrap Drupal.
  • --url and DRUPAL_URI select the multisite directory.
  • A URI without a scheme defaults to http://.

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