Add unit tests for wp_check_php_version() in wp-admin/includes/misc.php #29921

Job	Run time
Core running from src / MacOS	1m 57s
Core running from build / MacOS	1m 17s
Core running from build / Windows	2m 56s
Core running from src / Windows	2m 58s
Core running from src / Linux	1m 45s
Core running from build / Linux	1m 43s
Slack Notifications	0s
Failed workflow tasks	0s
	12m 36s

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