Icons: Add label search support to WP_Icons_Registry #27347

Job	Run time
Core running from src / Linux	1m 33s
Core running from build / Linux	1m 43s
Core running from src / MacOS	1m 40s
Core running from build / MacOS	1m 37s
Core running from src / Windows	3m 1s
Core running from build / Windows	4m 2s
Slack Notifications	0s
Failed workflow tasks	0s
	13m 36s

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