WP_Icons_Registry: make Gutenberg-side iteration easier #26296

Job	Run time
Core running from src / Linux	4m 12s
Core running from build / Linux	4m 11s
Core running from build / Windows	7m 24s
Core running from src / Windows	7m 36s
Core running from src / MacOS	4m 16s
Core running from build / MacOS	6m 8s
Slack Notifications	0s
Failed workflow tasks	0s
	33m 47s

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