Remove "PHID Manager" Tool list interface
Summary: This was well-intentioned but has not actually proven to be useful.
Test Plan:
- No list tab shows up anymore.
- Looked up a PHID.
Reviewers: btrahan, jungejason, Girish
Reviewed By: Girish
CC: aran, jungejason, edward, emiraga, Girish, nh, tuomaspelkonen, epriestley
Maniphest Tasks: T631
Differential Revision: 1234