Global Styles: Avoid unnecessary processing of theme.json variation partials #6649

Job	Run time
Core running from build / Core running from build / Linux	2m 7s
Core running from src / Core running from src / Linux	1m 55s
Core running from build / Core running from build / Windows	5m 0s
Core running from src / Core running from src / Windows	3m 14s
Core running from build / Core running from build / MacOS	1m 38s
Core running from src / Core running from src / MacOS	2m 29s
Gutenberg running from build / Gutenberg running from build / Linux	8m 21s
Gutenberg running from src / Gutenberg running from src / Linux	8m 7s
Gutenberg running from build / Gutenberg running from build / Windows	11m 58s
Gutenberg running from src / Gutenberg running from src / Windows	11m 31s
Gutenberg running from build / Gutenberg running from build / MacOS	9m 6s
Gutenberg running from src / Gutenberg running from src / MacOS	8m 48s
Slack Notifications	0s
Failed workflow tasks	0s
	1h 14m 14s

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