AO3-6775 Create delete_work_notification mailer preview (#5057) #5289

Job	Run time
rake db:otwseed	1m 15s
rspec spec/controllers	12m 49s
rspec spec/models	5m 10s
rspec --exclude-pattern 'spec/{controllers,models}/*/.rb'	8m 31s
cucumber features/admins	8m 47s
cucumber features/bookmarks	4m 54s
cucumber features/collections	6m 14s
cucumber features/comments_and_kudos	6m 37s
cucumber features/gift_exchanges	7m 36s
cucumber features/importing	2m 34s
cucumber features/other_a	10m 52s
cucumber features/other_b	6m 57s
cucumber features/prompt_memes_a	3m 56s
cucumber features/prompt_memes_b	4m 9s
cucumber features/prompt_memes_c	5m 3s
cucumber features/search	6m 22s
cucumber features/tag_sets	3m 26s
cucumber features/tags_and_wrangling	6m 40s
cucumber features/users	4m 52s
cucumber features/works	12m 12s
	2h 8m 56s

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