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Update "arc amend" for Toolsets

Description

Update "arc amend" for Toolsets

Summary: Ref T13490. Moves "arc amend" to Toolsets with modern ref/hardpoint code.

Test Plan: Ran "arc amend --show", "--revision", etc. Hit all the prompts and errors, probably?

Maniphest Tasks: T13490

Differential Revision: https://secure.phabricator.com/D21095

Details