AO3-4595 Allow certain admins to update pseud descriptions and icons #2766

Job	Run time
rake db:otwseed	1m 35s
rspec spec/controllers	18m 8s
rspec spec/models	9m 4s
rspec --exclude-pattern 'spec/{controllers,models}/*/.rb'	13m 28s
cucumber features/admins	6m 3s
cucumber features/bookmarks	5m 29s
cucumber features/collections	7m 27s
cucumber features/comments_and_kudos	6m 56s
cucumber features/gift_exchanges	9m 31s
cucumber features/importing	3m 24s
cucumber features/other_a	14m 1s
cucumber features/other_b	6m 33s
cucumber features/prompt_memes_a	7m 0s
cucumber features/prompt_memes_b	7m 0s
cucumber features/prompt_memes_c	7m 34s
cucumber features/search	10m 0s
cucumber features/tag_sets	4m 10s
cucumber features/tags_and_wrangling	7m 4s
cucumber features/users	5m 36s
cucumber features/works	20m 34s
	2h 50m 37s

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