Icons: Add label search support to WP_Icons_Registry #27425

Job	Run time
Core running from src / Linux	2m 19s
Core running from src / MacOS	2m 21s
Core running from build / Windows	4m 9s
Core running from build / Linux	2m 37s
Core running from build / MacOS	1m 59s
Core running from src / Windows	4m 7s
Slack Notifications	0s
Failed workflow tasks	0s
	17m 32s

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