Remove all hardcoded behaviors associated with task priorities

Summary:
Ref T3583. Currently, we have some hard-coded behaviors associated with the "Unbreak Now" and "Needs Triage" priorities. Remove them:

  - Users seem somewhat confused by these on occasion, and never seem to think they're cool/useful (that I've seen, at least).
  - I think they have low utility in general, see T3583.
  - Saves three queries on the home page, which can no longer use row counting since they must be policy filtered.
  - Primarily, this paves the way for allowing installs to customize priorities, which is an occasional request.

Also deletes a lot of code with no callsites.

Test Plan: Mostly `grep`. Loaded home page. Viewed reports and task list.

Reviewers: btrahan

Reviewed By: btrahan

CC: chad, aran

Maniphest Tasks: T3583

Differential Revision: https://secure.phabricator.com/D6981

src/applications/directory/controller/PhabricatorDirectoryMainController.php

@@ -32,12 +32,8 @@ final class PhabricatorDirectoryMainController
 
     $maniphest = 'PhabricatorApplicationManiphest';
     if (PhabricatorApplication::isClassInstalled($maniphest)) {
-      $unbreak_panel = $this->buildUnbreakNowPanel();
-      $triage_panel = $this->buildNeedsTriagePanel($projects);
       $tasks_panel = $this->buildTasksPanel();
     } else {
-      $unbreak_panel = null;
-      $triage_panel = null;
       $tasks_panel = null;
     }
 
@@ -54,8 +50,6 @@ final class PhabricatorDirectoryMainController
     $content = array(
       $jump_panel,
       $welcome_panel,
-      $unbreak_panel,
-      $triage_panel,
       $revision_panel,
       $tasks_panel,
       $audit_panel,
@@ -96,88 +90,6 @@ final class PhabricatorDirectoryMainController
     }
   }
 
-  private function buildUnbreakNowPanel() {
-    $user = $this->getRequest()->getUser();
-
-    $task_query = id(new ManiphestTaskQuery())
-      ->setViewer($user)
-      ->withStatus(ManiphestTaskQuery::STATUS_OPEN)
-      ->withPriority(ManiphestTaskPriority::PRIORITY_UNBREAK_NOW)
-      ->setLimit(10);
-
-    $tasks = $task_query->execute();
-
-    if (!$tasks) {
-      return $this->renderMiniPanel(
-        'No "Unbreak Now!" Tasks',
-        'Nothing appears to be critically broken right now.');
-    }
-
-    $panel = new AphrontPanelView();
-    $panel->setHeader('Unbreak Now!');
-    $panel->setCaption('Open tasks with "Unbreak Now!" priority.');
-    $panel->addButton(
-      phutil_tag(
-        'a',
-        array(
-          'href' => '/maniphest/view/all/',
-          'class' => 'grey button',
-        ),
-        "View All Unbreak Now \xC2\xBB"));
-
-    $panel->appendChild($this->buildTaskListView($tasks));
-    $panel->setNoBackground();
-
-    return $panel;
-  }
-
-  private function buildNeedsTriagePanel(array $projects) {
-    assert_instances_of($projects, 'PhabricatorProject');
-
-    $user = $this->getRequest()->getUser();
-
-    if ($projects) {
-      $task_query = id(new ManiphestTaskQuery())
-        ->setViewer($user)
-        ->withStatus(ManiphestTaskQuery::STATUS_OPEN)
-        ->withPriority(ManiphestTaskPriority::PRIORITY_TRIAGE)
-        ->withAnyProjects(mpull($projects, 'getPHID'))
-        ->setLimit(10);
-      $tasks = $task_query->execute();
-    } else {
-      $tasks = array();
-    }
-
-    if (!$tasks) {
-      return $this->renderMiniPanel(
-        'No "Needs Triage" Tasks',
-        hsprintf(
-          'No tasks in <a href="/project/">projects you are a member of</a> '.
-          'need triage.'));
-    }
-
-    $panel = new AphrontPanelView();
-    $panel->setHeader('Needs Triage');
-    $panel->setCaption(hsprintf(
-      'Open tasks with "Needs Triage" priority in '.
-      '<a href="/project/">projects you are a member of</a>.'));
-
-    $panel->addButton(
-      phutil_tag(
-        'a',
-        array(
-          // TODO: This should filter to just your projects' need-triage
-          // tasks?
-          'href' => '/maniphest/view/projecttriage/',
-          'class' => 'grey button',
-        ),
-        "View All Triage \xC2\xBB"));
-    $panel->appendChild($this->buildTaskListView($tasks));
-    $panel->setNoBackground();
-
-    return $panel;
-  }
-
   private function buildRevisionPanel() {
     $user = $this->getRequest()->getUser();
     $user_phid = $user->getPHID();