AO3-6314 Remove column dead from external_works table (#4506) #3307

Job	Run time
rake db:otwseed	1m 11s
rspec spec/controllers	10m 29s
rspec spec/models	5m 59s
rspec --exclude-pattern 'spec/{controllers,models}/*/.rb'	8m 0s
cucumber features/admins	4m 45s
cucumber features/bookmarks	4m 40s
cucumber features/collections	5m 48s
cucumber features/comments_and_kudos	5m 52s
cucumber features/gift_exchanges	6m 41s
cucumber features/importing	2m 33s
cucumber features/other_a	9m 38s
cucumber features/other_b	5m 58s
cucumber features/prompt_memes_a	3m 57s
cucumber features/prompt_memes_b	3m 34s
cucumber features/prompt_memes_c	4m 51s
cucumber features/search	6m 32s
cucumber features/tag_sets	3m 28s
cucumber features/tags_and_wrangling	5m 42s
cucumber features/users	4m 34s
cucumber features/works	13m 16s
	1h 57m 28s

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