Global styles revisions: add route for single styles revisions #162

Job	Run time
Core running from build / Core running from build / Linux	2m 4s
Core running from build / Core running from build / Windows	3m 54s
Core running from src / Core running from src / Linux	1m 58s
Core running from src / Core running from src / Windows	6m 0s
Core running from build / Core running from build / MacOS	3m 52s
Core running from src / Core running from src / MacOS	3m 54s
Gutenberg running from build / Gutenberg running from build / Linux	7m 22s
Gutenberg running from src / Gutenberg running from src / Linux	13m 24s
Gutenberg running from build / Gutenberg running from build / Windows	10m 47s
Gutenberg running from src / Gutenberg running from src / Windows	10m 33s
Gutenberg running from build / Gutenberg running from build / MacOS	19m 17s
Gutenberg running from src / Gutenberg running from src / MacOS	14m 3s
Slack Notifications	0s
Failed workflow tasks	0s
	1h 37m 8s

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