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test(setup): Improve db detection and web-root resolution coverage #31185

Job	Run time
changes	10s
Sharding - MySQL 9.7 (PHP 8.5) - database tests	9m 49s
Sharding - MySQL 8.4 (PHP 8.3) - database tests	10m 33s
phpunit-mysql-summary	6s
	20m 38s