AO3-6848 Create unique tags for mailer preview (#5031) #4988

Job	Run time
rake db:otwseed	1m 13s
rspec spec/controllers	12m 53s
rspec spec/models	6m 59s
rspec --exclude-pattern 'spec/{controllers,models}/*/.rb'	8m 18s
cucumber features/admins	7m 17s
cucumber features/bookmarks	4m 27s
cucumber features/collections	6m 15s
cucumber features/comments_and_kudos	6m 51s
cucumber features/gift_exchanges	6m 57s
cucumber features/importing	3m 4s
cucumber features/other_a	12m 10s
cucumber features/other_b	7m 19s
cucumber features/prompt_memes_a	4m 16s
cucumber features/prompt_memes_b	3m 47s
cucumber features/prompt_memes_c	4m 59s
cucumber features/search	6m 50s
cucumber features/tag_sets	4m 28s
cucumber features/tags_and_wrangling	7m 19s
cucumber features/users	5m 17s
cucumber features/works	13m 53s
	2h 14m 32s

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