Renaming filter to 'propagate_network_user_spam_to_blogs' and adding unit testcases #29509

Job	Run time
Determine Matrix	4s
Single Site Default / Test before	12m 35s
Multisite Memcached / Test before	12m 44s
Multisite Default / Test before	12m 44s
Multisite Default / Test current	13m 7s
Multisite Memcached / Test current	12m 52s
Single Site Memcached / Test before	12m 51s
Single Site Default / Test current	12m 43s
Single Site Memcached / Test current	13m 24s
Compare / Multisite Default	9s
Compare / Single Site Default	20s
Compare / Multisite Memcached	11s
Compare / Single Site Memcached	12s
Failed workflow tasks	0s
Slack Notifications	0s
	1h 43m 56s

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