Remove some obsolete lint and unit support

Summary:
Ref T8096.

Long ago, support for "postponed" lint and unit tests got hacked in. `arc` would publish a bunch of ghost results, and then something else would fill the results in later.

This was always a hack. It is not nearly as powerful or flexible as having a real build system, and is obsolete with Harbormaster, which supports these operations in a more reasonable and straightforward way.

This was used (only? almost only?) at Facebook.

  - Remove `differential.finishpostponedlinters`. This only served to update postponed linters.
  - Remove lint magic in `differential.setdiffproperty`. This magic only made sense in the context of postponed linters.
  - Remove `differential.updateunitresults`. The only made sense for postponed unit tests.

And one minor change: when a diff contains >100 affected files, we hide the content by default, but show content for files with inline comments. Previously, we'd do this for lint inlines, too. I don't tink this is too useful, and it's much simpler to just remove it. We could add it back at some point, but I think large changes often trigger a lot of lint and no one actually cares. The behavior for actual human inlines is retained.

Test Plan: `grep`

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T8096

Differential Revision: https://secure.phabricator.com/D13848

src/applications/differential/controller/DifferentialRevisionViewController.php

@@ -191,16 +191,6 @@ final class DifferentialRevisionViewController extends DifferentialController {
           $visible_changesets[$changeset_id] = $changesets[$changeset_id];
         }
       }
-
-      if (!empty($props['arc:lint'])) {
-        $changeset_paths = mpull($changesets, null, 'getFilename');
-        foreach ($props['arc:lint'] as $lint) {
-          $changeset = idx($changeset_paths, $lint['path']);
-          if ($changeset) {
-            $visible_changesets[$changeset->getID()] = $changeset;
-          }
-        }
-      }
     } else {
       $warning = null;
       $visible_changesets = $changesets;