Adds "Needs: Author Feedback" if "Needs: Repro" is applied

Summary:
As the title says, if we discover that an issue needs a repro, then we should also apply
the "Needs: Author Feedback" as that will make the issue stale quicker (30 days) rather than (90)

Changelog:
[Internal] [Changed] - Adds "Needs: Author Feedback" if "Needs: Repro" is applied

Reviewed By: NickGerleman

Differential Revision: D51895945

fbshipit-source-id: 3ed651aec96795ada3e7c28b0f1e68d68f7fc870