Show build plan name on Harbormaster plan view controller

Summary: Ref T8096. This shows the build plan name on the Harbormaster build plan view controller. Without this, the name is not displayed anywhere on the page when you're viewing a build plan's configuration (which makes things confusing if you're updating a bunch of build plans at once).

Test Plan: Viewed a build plan, saw the build plan name on the page.

Reviewers: epriestley, #blessed_reviewers

Reviewed By: epriestley, #blessed_reviewers

Subscribers: epriestley, Korvin

Projects: #harbormaster

Maniphest Tasks: T8096

Differential Revision: https://secure.phabricator.com/D13356