Media: Skip server image support check when not generating sub-sizes #33329

Job	Run time
Determine Matrix	6s
Multisite Memcached / Test current	13m 12s
Multisite Default / Test current	14m 13s
Single Site Memcached / Test before	13m 27s
Single Site Default / Test current	13m 1s
Multisite Default / Test before	12m 57s
Single Site Memcached / Test current	14m 53s
Multisite Memcached / Test before	14m 15s
Single Site Default / Test before	13m 12s
Compare / Single Site Default	44s
Compare / Single Site Memcached	20s
Compare / Multisite Default	22s
Compare / Multisite Memcached	25s
Slack Notifications	0s
Failed workflow tasks	0s
	1h 51m 7s

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