AO3-5578 Use ActiveStorage for existing image uploads #4846

Job	Run time
rake db:otwseed	1m 17s
rspec spec/controllers	12m 58s
rspec spec/models	5m 19s
rspec --exclude-pattern 'spec/{controllers,models}/*/.rb'	8m 54s
cucumber features/admins	7m 1s
cucumber features/bookmarks	5m 41s
cucumber features/collections	7m 35s
cucumber features/comments_and_kudos	7m 55s
cucumber features/gift_exchanges	7m 11s
cucumber features/importing	3m 14s
cucumber features/other_a	11m 6s
cucumber features/other_b	7m 49s
cucumber features/prompt_memes_a	4m 51s
cucumber features/prompt_memes_b	4m 2s
cucumber features/prompt_memes_c	7m 2s
cucumber features/search	6m 36s
cucumber features/tag_sets	3m 15s
cucumber features/tags_and_wrangling	6m 51s
cucumber features/users	4m 56s
cucumber features/works	13m 15s
	2h 16m 48s

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