Block variations: Add class name #7913

Job	Run time
Core running from build / Core running from build / Linux	2m 17s
Core running from src / Core running from src / Linux	1m 56s
Core running from src / Core running from src / Windows	3m 51s
Core running from build / Core running from build / Windows	3m 46s
Core running from build / Core running from build / MacOS	2m 2s
Core running from src / Core running from src / MacOS	2m 0s
Gutenberg running from build / Gutenberg running from build / Linux	7m 39s
Gutenberg running from src / Gutenberg running from src / Linux	7m 41s
Gutenberg running from build / Gutenberg running from build / Windows	12m 33s
Gutenberg running from src / Gutenberg running from src / Windows	11m 53s
Gutenberg running from build / Gutenberg running from build / MacOS	8m 7s
Gutenberg running from src / Gutenberg running from src / MacOS	6m 47s
Slack Notifications	0s
Failed workflow tasks	0s
	1h 10m 32s

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