Connectors: Add is_active callback support to plugin registration #35038

Job	Run time
Determine Matrix	3s
Multisite Memcached / Test before	12m 50s
Multisite Default / Test current	13m 47s
Multisite Default / Test before	14m 28s
Multisite Memcached / Test current	13m 38s
Single Site Default / Test current	14m 17s
Single Site Memcached / Test current	12m 44s
Single Site Default / Test before	13m 16s
Single Site Memcached / Test before	14m 50s
Compare / Multisite Memcached	13s
Compare / Multisite Default	11s
Compare / Single Site Memcached	13s
Compare / Single Site Default	16s
Failed workflow tasks	-1s
Slack Notifications	-1s
	1h 50m 44s

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