Fix a PHP 8.1 strlen() issue with "mysql.pass" configuration
Ref T13588. This configuration value may not be set.
Also fix an issue in bin/storage and whatever else I hit between now and this diff actually uploading.
Also fix a MySQLi report mode difference, beginning in PHP 8.1.
Also update a bunch of "static" property usage in Lisk.
Test Plan: Ran bin/files ... locally under PHP 8.1.
Maniphest Tasks: T13588
Differential Revision: https://secure.phabricator.com/D21744