Summary:
This diff adds commit hash field in the support form v2 and we prefill the information.
If changes are not pushed to phabricator we will populate it with commit hash or else we will populate it with Diff number.
See the demo to understand the flow.
{F222000517}
Reviewed By: jknoxville
Differential Revision: D18427044
fbshipit-source-id: 80a58baca381e21203da5670e29144a7e8c2eeed