Remove "project.name" from `.arcconfig"
Summary: Ref T7604. Remove the project.name configuration from .arcconfig. Depends on D12999.
Test Plan: N/A
Reviewers: epriestley, Blessed Reviewers
Reviewed By: epriestley, Blessed Reviewers
Subscribers: Korvin, epriestley
Maniphest Tasks: T7604
Differential Revision: https://secure.phabricator.com/D13002