feature #49795 add debug:scheduler command (kbond)

This PR was squashed before being merged into the 6.3 branch.

Discussion
----------

add `debug:scheduler` command

| Q             | A
| ------------- | ---
| Branch?       | 6.3
| Bug fix?      | no
| New feature?  | yes
| Deprecations? | no
| Tickets       | n/a
| License       | MIT
| Doc PR        | todo

Example output:

```
Scheduler
=========

default
-------

 ---------------------- ------------------- ---------------------------
  Message                Trigger             Next Run
 ---------------------- ------------------- ---------------------------
  stdClass               cron: 10 10 5 2 0   2024-02-04T10:10:00-05:00
  generate user report   cron: 0 0 * * *     2023-03-25T00:00:00-04:00
 ---------------------- ------------------- ---------------------------
```

The output is helped if the trigger and message implement `\Stringable`. I've made `CronExpressionTrigger` stringable but I think we should have all the packaged triggers implement.

Commits
-------

398e2b2708 add `debug:scheduler` command

Author: fabpot

DependencyInjection/FrameworkExtension.php

@@ -2016,6 +2016,10 @@ private function registerSchedulerConfiguration(array $config, ContainerBuilder
         }
 
         $loader->load('scheduler.php');
+
+        if (!$this->hasConsole()) {
+            $container->removeDefinition('console.command.scheduler_debug');
+        }
     }
 
     private function registerMessengerConfiguration(array $config, ContainerBuilder $container, PhpFileLoader $loader, bool $validationEnabled): void

Resources/config/console.php

@@ -42,13 +42,14 @@
 use Symfony\Component\Console\EventListener\ErrorListener;
 use Symfony\Component\Dotenv\Command\DebugCommand as DotenvDebugCommand;
 use Symfony\Component\Messenger\Command\ConsumeMessagesCommand;
-use Symfony\Component\Messenger\Command\DebugCommand;
+use Symfony\Component\Messenger\Command\DebugCommand as MessengerDebugCommand;
 use Symfony\Component\Messenger\Command\FailedMessagesRemoveCommand;
 use Symfony\Component\Messenger\Command\FailedMessagesRetryCommand;
 use Symfony\Component\Messenger\Command\FailedMessagesShowCommand;
 use Symfony\Component\Messenger\Command\SetupTransportsCommand;
 use Symfony\Component\Messenger\Command\StatsCommand;
 use Symfony\Component\Messenger\Command\StopWorkersCommand;
+use Symfony\Component\Scheduler\Command\DebugCommand as SchedulerDebugCommand;
 use Symfony\Component\Translation\Command\TranslationPullCommand;
 use Symfony\Component\Translation\Command\TranslationPushCommand;
 use Symfony\Component\Translation\Command\XliffLintCommand;
@@ -172,7 +173,7 @@
             ])
             ->tag('console.command')
 
-        ->set('console.command.messenger_debug', DebugCommand::class)
+        ->set('console.command.messenger_debug', MessengerDebugCommand::class)
             ->args([
                 [], // Message to handlers mapping
             ])
@@ -218,6 +219,12 @@
             ])
             ->tag('console.command')
 
+        ->set('console.command.scheduler_debug', SchedulerDebugCommand::class)
+            ->args([
+                tagged_locator('scheduler.schedule_provider', 'name'),
+            ])
+            ->tag('console.command')
+
         ->set('console.command.router_debug', RouterDebugCommand::class)
             ->args([
                 service('router'),