Add speculative loading support #13165

Job	Run time
Core running from src / Core running from src / Linux	1m 58s
Core running from build / Core running from build / Linux	2m 11s
Core running from build / Core running from build / Windows	4m 7s
Core running from src / Core running from src / Windows	3m 55s
Core running from src / Core running from src / MacOS	2m 18s
Gutenberg running from build / Gutenberg running from build / Linux	8m 51s
Core running from build / Core running from build / MacOS	1m 56s
Gutenberg running from src / Gutenberg running from src / Linux	8m 33s
Gutenberg running from build / Gutenberg running from build / Windows	11m 35s
Gutenberg running from src / Gutenberg running from src / Windows	12m 7s
Gutenberg running from build / Gutenberg running from build / MacOS	7m 19s
Gutenberg running from src / Gutenberg running from src / MacOS	9m 13s
Slack Notifications	0s
Failed workflow tasks	0s
	1h 14m 3s

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