Build/Test Tools: Introduce `LOCAL_DB_PORTS` environment variable. #2453

Job	Run time
Single site report / PHP 8.3 with MySQL 8.4	46m 16s
Multisite report / PHP 8.3 with MySQL 8.4 multisite	46m 35s
Slack Notifications / Prepare notifications	4s
Slack Notifications / Success notifications	3s
Slack Notifications / Failure notifications	0s
Slack Notifications / Cancelled notifications	0s
Slack Notifications / Fixed notifications	0s
Failed workflow tasks	0s
	1h 32m 58s

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