HTML API: Replace null-bytes in class_list class names #9292

Job	Run time
Core running from build / Core running from build / Linux	1m 58s
Core running from src / Core running from src / Linux	2m 5s
Core running from build / Core running from build / Windows	3m 41s
Core running from src / Core running from src / Windows	4m 13s
Core running from build / Core running from build / MacOS	2m 4s
Core running from src / Core running from src / MacOS	1m 30s
Gutenberg running from build / Gutenberg running from build / Linux	8m 3s
Gutenberg running from src / Gutenberg running from src / Linux	7m 54s
Gutenberg running from build / Gutenberg running from build / Windows	11m 26s
Gutenberg running from src / Gutenberg running from src / Windows	11m 8s
Gutenberg running from build / Gutenberg running from build / MacOS	7m 37s
Gutenberg running from src / Gutenberg running from src / MacOS	7m 16s
Slack Notifications	0s
Failed workflow tasks	0s
	1h 8m 55s

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