Fix: Add explicit global declarations for core variables #14354

Job	Run time
Core running from build / Core running from build / Linux	2m 9s
Core running from src / Core running from src / Linux	2m 7s
Core running from build / Core running from build / Windows	3m 46s
Core running from src / Core running from src / Windows	3m 34s
Core running from build / Core running from build / MacOS	3m 13s
Core running from src / Core running from src / MacOS	2m 22s
Gutenberg running from build / Gutenberg running from build / Linux	9m 8s
Gutenberg running from src / Gutenberg running from src / Linux	8m 41s
Gutenberg running from build / Gutenberg running from build / Windows	12m 28s
Gutenberg running from src / Gutenberg running from src / Windows	14m 6s
Gutenberg running from build / Gutenberg running from build / MacOS	9m 8s
Gutenberg running from src / Gutenberg running from src / MacOS	9m 0s
Slack Notifications	0s
Failed workflow tasks	0s
	1h 19m 42s

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