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[31628] made it possible to pass an `$autoload` param to `update_option()` that applies when the option does not yet exist in the database. The current changeset introduces parity for existing options: the `$autoload` setting for existing options can be changed via the `$autoload` parameter. For internal simplicity, `$autoload` is ignored for existing options when `$value` is not also changed. This changeset also moves `update_option()` tests into their own class. Props dd32. Fixes #26394. git-svn-id: https://develop.svn.wordpress.org/trunk@31640 602fd350-edb4-49c9-b593-d223f7449a82