Strip comments during arc diff --verbatim workflow before submitting to Phabricator
Summary: Fixes T4649. The issue in that task is caused because we're submitting a block of text including comments. We've probably been doing this for a long time, but maybe were more liberal in parsing before. Instead, strip them.
Test Plan: Ran arc diff --verbatim and got "Dxxx" prefilled correctly.
Reviewers: btrahan
Reviewed By: btrahan
Subscribers: epriestley
Maniphest Tasks: T4649
Differential Revision: https://secure.phabricator.com/D8658