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3052: Rename add import assist r=matklad a=SomeoneToIgnore Based on the https://rust-lang.zulipchat.com/#narrow/stream/185405-t-compiler.2Fwg-rls-2.2E0/topic/2.20assists.20with.20the.20same.20action.20name/near/187655643 and the related discussion. Co-authored-by: Kirill Bulatov <mail4score@gmail.com>