Run PHPUnit Tests

Move test files into `tests/phpunit/`. (#182) #178

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Run time

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Job	Run time
Run tests (PHP 7.4, Multisite)	31s
Run tests (PHP 7.4, Single Site)	37s
Run tests (PHP 8.3, Multisite)	30s
Run tests (PHP 8.3, Single Site)	28s
	2m 6s