Embeds: Fix get_site_icon_url() dropping fallback when attachment URL… #35173

Job	Run time
Determine Matrix	3s
Multisite Memcached / Test before	13m 8s
Single Site Default / Test current	12m 27s
Single Site Default / Test before	13m 58s
Multisite Memcached / Test current	13m 31s
Single Site Memcached / Test before	13m 11s
Multisite Default / Test current	16m 41s
Single Site Memcached / Test current	13m 16s
Multisite Default / Test before	12m 31s
Compare / Single Site Memcached	13s
Compare / Single Site Default	12s
Compare / Multisite Default	19s
Compare / Multisite Memcached	15s
Slack Notifications	0s
Failed workflow tasks	-1s
	1h 49m 44s

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