AO3-6872 Only notify creators when a work is added to a collection by an archivist #4931

Job	Run time
rake db:otwseed	1m 13s
rspec spec/controllers	13m 43s
rspec spec/models	6m 23s
rspec --exclude-pattern 'spec/{controllers,models}/*/.rb'	9m 11s
cucumber features/admins	7m 31s
cucumber features/bookmarks	5m 36s
cucumber features/collections	6m 21s
cucumber features/comments_and_kudos	6m 39s
cucumber features/gift_exchanges	7m 37s
cucumber features/importing	2m 46s
cucumber features/other_a	11m 32s
cucumber features/other_b	6m 26s
cucumber features/prompt_memes_a	4m 1s
cucumber features/prompt_memes_b	3m 30s
cucumber features/prompt_memes_c	5m 53s
cucumber features/search	7m 59s
cucumber features/tag_sets	3m 36s
cucumber features/tags_and_wrangling	6m 31s
cucumber features/users	6m 26s
cucumber features/works	13m 54s
	2h 16m 48s

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