Add word-break property to screen reader only classes. #23146

Job	Run time
Core running from build / Windows	3m 53s
Core running from build / Linux	2m 37s
Core running from src / Windows	3m 50s
Core running from src / Linux	2m 25s
Core running from src / MacOS	4m 5s
Gutenberg running from build / MacOS	10m 50s
Gutenberg running from build / Windows	13m 20s
Gutenberg running from src / Linux	8m 46s
Gutenberg running from build / Linux	9m 20s
Gutenberg running from src / MacOS	13m 30s
Core running from build / MacOS	2m 19s
Gutenberg running from src / Windows	13m 42s
Slack Notifications	-1s
Failed workflow tasks	-1s
	1h 28m 35s

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