AO3-5610 notify users when a bookmark or series they have created is hidden #3766

Job	Run time
rake db:otwseed	1m 10s
rspec spec/controllers	10m 13s
rspec spec/models	5m 24s
rspec --exclude-pattern 'spec/{controllers,models}/*/.rb'	4m 58s
cucumber features/admins	5m 2s
cucumber features/bookmarks	5m 33s
cucumber features/collections	6m 19s
cucumber features/comments_and_kudos	5m 29s
cucumber features/gift_exchanges	7m 5s
cucumber features/importing	2m 58s
cucumber features/other_a	9m 49s
cucumber features/other_b	6m 29s
cucumber features/prompt_memes_a	3m 55s
cucumber features/prompt_memes_b	3m 19s
cucumber features/prompt_memes_c	5m 15s
cucumber features/search	6m 7s
cucumber features/tag_sets	3m 10s
cucumber features/tags_and_wrangling	5m 48s
cucumber features/users	4m 32s
cucumber features/works	12m 27s
	1h 55m 2s

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