AO3-6835 Create change_email mailer preview #4683

Job	Run time
rake db:otwseed	1m 4s
rspec spec/controllers	11m 53s
rspec spec/models	5m 24s
rspec --exclude-pattern 'spec/{controllers,models}/*/.rb'	7m 40s
cucumber features/admins	6m 23s
cucumber features/bookmarks	4m 27s
cucumber features/collections	6m 7s
cucumber features/comments_and_kudos	6m 30s
cucumber features/gift_exchanges	7m 29s
cucumber features/importing	2m 42s
cucumber features/other_a	10m 40s
cucumber features/other_b	5m 51s
cucumber features/prompt_memes_a	4m 4s
cucumber features/prompt_memes_b	3m 36s
cucumber features/prompt_memes_c	4m 51s
cucumber features/search	6m 41s
cucumber features/tag_sets	3m 27s
cucumber features/tags_and_wrangling	5m 39s
cucumber features/users	5m 6s
cucumber features/works	13m 40s
	2h 3m 14s

Provide feedback