HTML API: Refactor `wp_kses_hair()` #29155

Job	Run time
Determine Matrix	5s
Multisite Memcached / Test before	12m 44s
Multisite Default / Test before	13m 24s
Single Site Memcached / Test current	12m 41s
Multisite Default / Test current	13m 12s
Multisite Memcached / Test current	13m 18s
Single Site Default / Test before	13m 5s
Single Site Memcached / Test before	13m 12s
Single Site Default / Test current	12m 58s
Slack Notifications	0s
Compare / Single Site Default	13s
Compare / Multisite Memcached	10s
Compare / Multisite Default	12s
Compare / Single Site Memcached	23s
Failed workflow tasks	-1s
	1h 45m 36s

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