Add unit tests for heartbeat_autosave() in wp-admin/includes/misc.php #29919

Job	Run time
Core running from src / Windows	2m 45s
Core running from src / Linux	1m 28s
Core running from src / MacOS	2m 0s
Core running from build / MacOS	1m 38s
Core running from build / Windows	2m 29s
Core running from build / Linux	1m 37s
Slack Notifications	0s
Failed workflow tasks	0s
	11m 57s

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