Run PHPUnit Tests

Add tests for `Admin_Settings::sanitize_settings()` #234

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Run time

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Job	Run time
Run tests (PHP 7.4, Multisite)	55s
Run tests (PHP 7.4, Single Site)	45s
Run tests (PHP 8.3, Multisite)	54s
Run tests (PHP 8.3, Single Site)	41s
	3m 15s