R1:02ed9f1368e5

Remove ManiphestTransactionDetailView

Summary: Ref T2217. No remaining callsites. Also nukes associated CSS.

Test Plan: `grep`, looked at some tasks.

Reviewers: btrahan

Reviewed By: btrahan

CC: chad, aran

Maniphest Tasks: T2217

Differential Revision: https://secure.phabricator.com/D7076