Issue #3224263 by jonathan1055: Remove scheduler.drush.inc as drush 8 is no...

Issue #3224263 by jonathan1055: Remove scheduler.drush.inc as drush 8 is no longer supported. Drush 9 is available from core 8.4

scheduler.drush.inc

-<?php
-
-/**
- * @file
- * Drush 8 commands for Scheduler.
- *
- * For Drush 9+ the commands are in src/Commands/SchedulerCommands.php.
- */
-
-/**
- * Implements hook_drush_command().
- */
-function scheduler_drush_command() {
-  $items = [];
-
-  $items['scheduler-cron'] = [
-    'description' => 'Lightweight cron to process Scheduler tasks.',
-    'core' => ['8+'],
-    'aliases' => ['sch-cron'],
-    'category' => 'scheduler',
-    'options' => [
-      'nomsg' => 'to avoid the "cron completed" message being written to the terminal.',
-    ],
-  ];
-
-  $items['scheduler-entity-update'] = [
-    'description' => 'Entity Update - Add missing Scheduler db fields for entities covered by plugins.',
-    'core' => ['8+'],
-    'aliases' => ['sch-ent-upd'],
-    'category' => 'scheduler',
-  ];
-  return $items;
-}
-
-/**
- * Run lightweight scheduler cron.
- */
-function drush_scheduler_cron() {
-  \Drupal::service('scheduler.manager')->runLightweightCron();
-  $nomsg = drush_get_option('nomsg', NULL);
-  $nomsg ? NULL : \Drupal::messenger()->addMessage(t('Scheduler lightweight cron completed'));
-}
-
-/**
- * Call SchedulerManager entityUpdate() to add missing db fields.
- */
-function drush_scheduler_entity_update() {
-  $result = \Drupal::service('scheduler.manager')->entityUpdate();
-  $updated = $result ? implode(', ', $result) : t('nothing to update');
-  \Drupal::messenger()->addMessage(t('Scheduler entity update - @updated', ['@updated' => $updated]));
-}