WP_Theme_JSON: preserve valid non-preset settings when KSES filters are active #22797

Job	Run time
Core running from build / MacOS	2m 26s
Core running from src / Linux	2m 27s
Core running from build / Windows	3m 48s
Core running from build / Linux	2m 34s
Core running from src / Windows	3m 49s
Core running from src / MacOS	2m 55s
Gutenberg running from build / Linux	8m 37s
Gutenberg running from src / Linux	9m 9s
Gutenberg running from src / Windows	13m 4s
Gutenberg running from src / MacOS	13m 39s
Gutenberg running from build / MacOS	16m 22s
Gutenberg running from build / Windows	13m 28s
Slack Notifications	0s
Failed workflow tasks	0s
	1h 32m 18s

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