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In "arc land" under Git, confirm branch creation

Authored by epriestley on Jun 11 2020, 1:45 PM.

Description

In "arc land" under Git, confirm branch creation

Summary: Ref T13546. If "arc land" would create a branch, warn the user before it does.

Test Plan: Ran "arc land --onto mtarse", a typo of "master".

Maniphest Tasks: T13546

Differential Revision: https://secure.phabricator.com/D21354