Fix a PHP 8.1 strlen() issue with "mysql.pass" configuration

Summary:
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