AO3-5578 Use rails_blob_url to allow ActiveStorage caching #4866

Job	Run time
rake db:otwseed	1m 15s
rspec spec/controllers	12m 29s
rspec spec/models	5m 42s
rspec --exclude-pattern 'spec/{controllers,models}/*/.rb'	8m 50s
cucumber features/admins	6m 59s
cucumber features/bookmarks	4m 40s
cucumber features/collections	6m 53s
cucumber features/comments_and_kudos	6m 44s
cucumber features/gift_exchanges	7m 5s
cucumber features/importing	2m 54s
cucumber features/other_a	10m 38s
cucumber features/other_b	8m 11s
cucumber features/prompt_memes_a	3m 59s
cucumber features/prompt_memes_b	4m 25s
cucumber features/prompt_memes_c	5m 4s
cucumber features/search	6m 37s
cucumber features/tag_sets	3m 15s
cucumber features/tags_and_wrangling	10m 17s
cucumber features/users	5m 0s
cucumber features/works	13m 6s
	2h 14m 3s

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