AO3-6210 Use cached number of tags on mass wrangling #3166

Job	Run time
rake db:otwseed	1m 36s
rspec spec/controllers	17m 32s
rspec spec/models	8m 11s
rspec --exclude-pattern 'spec/{controllers,models}/*/.rb'	13m 5s
cucumber features/admins	8m 1s
cucumber features/bookmarks	5m 57s
cucumber features/collections	12m 57s
cucumber features/comments_and_kudos	7m 39s
cucumber features/gift_exchanges	10m 2s
cucumber features/importing	3m 18s
cucumber features/other_a	11m 4s
cucumber features/other_b	6m 27s
cucumber features/prompt_memes_a	4m 40s
cucumber features/prompt_memes_b	4m 51s
cucumber features/prompt_memes_c	6m 22s
cucumber features/search	9m 33s
cucumber features/tag_sets	3m 43s
cucumber features/tags_and_wrangling	7m 37s
cucumber features/users	4m 49s
cucumber features/works	15m 0s
	2h 42m 24s

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