Continue reducing callsites to ArcanistDifferentialRevisionStatus

Summary:
Ref T2543. Further consolidates status management into DifferentialRevisionStatus.

One change I'm making here is internally renaming "CLOSED" to "PUBLISHED". The UI will continue to say "Closed", at least for now, but this should make the code more clear because we care about "is closed, exactly" vs "is any closed status (closed, abandoned, sometimes accepted)". This distinction is more obvious as `isClosed()` vs `isPublished()` than, e.g., `isClosedWithExactlyTheClosedStatus()` or something. I think "Published" is generally more clear, too, and more consistent with modern language (e.g., "pre-publish review" replacing "pre-commit review" to make it more clear what we mean in Git/Mercurial).

I've removed the IN_PREPARATION status since this was just earlier groundwork for "Draft" and not actually used, and under the newer plan I'm trying to just abandon `ArcanistDifferentialRevisionStatus` entirely (or, at least, substantially).

Test Plan:
- Viewed revisions.
- Viewed revision list.
- Viewed revisions linked to a task in Maniphest.
- Viewed revision graph of dependencies in Differential.
- Grepped for `COLOR_STATUS_...` constants.
- Grepped for removed method `getRevisionStatusIcon()` (no callsites).
- Grepped for removed method `renderFullDescription()` (one callsite, replaced with just building a `TagView` inline).
- Grepped for removed method `isClosedStatus()` (no callsites after other changes).

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T2543

Differential Revision: https://secure.phabricator.com/D18340

src/applications/differential/controller/DifferentialRevisionViewController.php

@@ -508,11 +508,13 @@ final class DifferentialRevisionViewController extends DifferentialController {
       ->setPolicyObject($revision)
       ->setHeaderIcon('fa-cog');
 
-    $status = $revision->getStatus();
-    $status_name =
-      DifferentialRevisionStatus::renderFullDescription($status);
+    $status_tag = id(new PHUITagView())
+      ->setName($revision->getStatusDisplayName())
+      ->setIcon($revision->getStatusIcon())
+      ->setColor($revision->getStatusIconColor())
+      ->setType(PHUITagView::TYPE_SHADE);
 
-    $view->addProperty(PHUIHeaderView::PROPERTY_STATUS, $status_name);
+    $view->addProperty(PHUIHeaderView::PROPERTY_STATUS, $status_tag);
 
     return $view;
   }