Media: Skip server image support check when not generating sub-sizes #33323

Job	Run time
Determine Matrix	4s
Multisite Memcached / Test current	4m 24s
Multisite Default / Test current	4m 32s
Single Site Default / Test current	4m 16s
Multisite Default / Test before	5m 22s
Multisite Memcached / Test before	5m 20s
Single Site Default / Test before	4m 30s
Single Site Memcached / Test before	4m 41s
Single Site Memcached / Test current	5m 21s
matrix.label	0s
Slack Notifications	0s
Failed workflow tasks	1s
	38m 31s

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