Remove bin/files purge workflow

Summary:
Fixes T12948. See that task for substantial discussion and context. Briefly:

  - This workflow is very old, and won't work for large (>2GB) files.
  - This workflow has become more dangerous than it once was, and can fail in several ways that delete data and/or make recovery much more difficult (see T12948 for more discussion).
  - This was originally added in D6068, which is a bit muddled, but looks like "one install ran into a weird issue so I wrote a script for them"; this would be a Consulting/Support issue and not come upstream today. I can't identify any arguments for retaining this workflow there, at least.

Test Plan:
  - Grepped for `files purge`, got nothing.
  - Grepped for `purge`, looked for anything that looked like instructions or documentation, got nothing.

I don't recall recommending anyone run this script in many years, and didn't even remember that it existed or what it did when T12948 was reported, so I believe it is not in widespread use.

Reviewers: joshuaspence, chad

Reviewed By: joshuaspence

Maniphest Tasks: T12948

Differential Revision: https://secure.phabricator.com/D18384

src/__phutil_library_map__.php

@@ -2900,7 +2900,6 @@ phutil_register_library_map(array(
     'PhabricatorFilesManagementGenerateKeyWorkflow' => 'applications/files/management/PhabricatorFilesManagementGenerateKeyWorkflow.php',
     'PhabricatorFilesManagementIntegrityWorkflow' => 'applications/files/management/PhabricatorFilesManagementIntegrityWorkflow.php',
     'PhabricatorFilesManagementMigrateWorkflow' => 'applications/files/management/PhabricatorFilesManagementMigrateWorkflow.php',
-    'PhabricatorFilesManagementPurgeWorkflow' => 'applications/files/management/PhabricatorFilesManagementPurgeWorkflow.php',
     'PhabricatorFilesManagementRebuildWorkflow' => 'applications/files/management/PhabricatorFilesManagementRebuildWorkflow.php',
     'PhabricatorFilesManagementWorkflow' => 'applications/files/management/PhabricatorFilesManagementWorkflow.php',
     'PhabricatorFilesOnDiskBuiltinFile' => 'applications/files/builtin/PhabricatorFilesOnDiskBuiltinFile.php',
@@ -8238,7 +8237,6 @@ phutil_register_library_map(array(
     'PhabricatorFilesManagementGenerateKeyWorkflow' => 'PhabricatorFilesManagementWorkflow',
     'PhabricatorFilesManagementIntegrityWorkflow' => 'PhabricatorFilesManagementWorkflow',
     'PhabricatorFilesManagementMigrateWorkflow' => 'PhabricatorFilesManagementWorkflow',
-    'PhabricatorFilesManagementPurgeWorkflow' => 'PhabricatorFilesManagementWorkflow',
     'PhabricatorFilesManagementRebuildWorkflow' => 'PhabricatorFilesManagementWorkflow',
     'PhabricatorFilesManagementWorkflow' => 'PhabricatorManagementWorkflow',
     'PhabricatorFilesOnDiskBuiltinFile' => 'PhabricatorFilesBuiltinFile',

src/applications/files/management/PhabricatorFilesManagementPurgeWorkflow.php

@@ -1,71 +0,0 @@
-<?php
-
-final class PhabricatorFilesManagementPurgeWorkflow
-  extends PhabricatorFilesManagementWorkflow {
-
-  protected function didConstruct() {
-    $this
-      ->setName('purge')
-      ->setSynopsis(pht('Delete files with missing data.'))
-      ->setArguments(
-        array(
-          array(
-            'name'      => 'all',
-            'help'      => pht('Update all files.'),
-          ),
-          array(
-            'name'      => 'dry-run',
-            'help'      => pht('Show what would be updated.'),
-          ),
-          array(
-            'name'      => 'names',
-            'wildcard'  => true,
-          ),
-        ));
-  }
-
-  public function execute(PhutilArgumentParser $args) {
-    $console = PhutilConsole::getConsole();
-
-    $iterator = $this->buildIterator($args);
-    if (!$iterator) {
-      throw new PhutilArgumentUsageException(
-        pht(
-          'Either specify a list of files to purge, or use `%s` '.
-          'to purge all files.',
-          '--all'));
-    }
-
-    $is_dry_run = $args->getArg('dry-run');
-
-    foreach ($iterator as $file) {
-      $fid = 'F'.$file->getID();
-
-      try {
-        $file->loadFileData();
-        $okay = true;
-      } catch (Exception $ex) {
-        $okay = false;
-      }
-
-      if ($okay) {
-        $console->writeOut(
-          "%s\n",
-          pht('%s: File data is OK, not purging.', $fid));
-      } else {
-        if ($is_dry_run) {
-          $console->writeOut(
-            "%s\n",
-            pht('%s: Would purge (dry run).', $fid));
-        } else {
-          $console->writeOut(
-            "%s\n",
-            pht('%s: Purging.', $fid));
-          $file->delete();
-        }
-      }
-    }
-
-    return 0;
-  }
-}