Global styles: cache post-processed style variations #6746

Job	Run time
Core running from build / Core running from build / Linux	1m 58s
Core running from src / Core running from src / Linux	1m 54s
Core running from build / Core running from build / Windows	4m 31s
Core running from src / Core running from src / Windows	3m 53s
Core running from build / Core running from build / MacOS	1m 52s
Core running from src / Core running from src / MacOS	2m 3s
Gutenberg running from build / Gutenberg running from build / MacOS	7m 53s
Gutenberg running from src / Gutenberg running from src / MacOS	7m 27s
Gutenberg running from build / Gutenberg running from build / Linux	8m 11s
Gutenberg running from src / Gutenberg running from src / Linux	8m 4s
Gutenberg running from build / Gutenberg running from build / Windows	10m 46s
Gutenberg running from src / Gutenberg running from src / Windows	11m 3s
Slack Notifications	0s
Failed workflow tasks	0s
	1h 9m 35s

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