[9.x] Fix schedule:list crash when call() is given class-string (#45306)

* [9.x] Fix schedule:list crash when call() is given class-string

When creating schedule of the form:

```php
        $this->schedule->call(FooCall::class);
        $this->schedule->call([FooCall::class, 'fooFunction']);
```

Then the `ScheduleListCommand::getClosureLocation()` method would crash with:

```
   TypeError

  Cannot use "::class" on value of type string
```

This PR fixes it by adding checks for string `$callback` and returning that string instead of adding `::class` to it.

Tests for both single string and array callable syntax included.

* Streamlined the array callable fix

src/Illuminate/Console/Scheduling/ScheduleListCommand.php

@@ -220,8 +220,14 @@ private function getClosureLocation(CallbackEvent $event)
             );
         }
 
+        if (is_string($callback)) {
+            return $callback;
+        }
+
         if (is_array($callback)) {
-            return sprintf('%s::%s', $callback[0]::class, $callback[1]);
+            $className = is_string($callback[0]) ? $callback[0] : $callback[0]::class;
+
+            return sprintf('%s::%s', $className, $callback[1]);
         }
 
         return sprintf('%s::__invoke', $callback::class);

tests/Integration/Console/Scheduling/ScheduleListCommandTest.php

@@ -36,6 +36,8 @@ public function testDisplaySchedule()
         $this->schedule->job(FooJob::class)->everyMinute();
         $this->schedule->command('inspire')->cron('0 9,17 * * *');
         $this->schedule->command('inspire')->cron("0 10\t* * *");
+        $this->schedule->call(FooCall::class)->everyMinute();
+        $this->schedule->call([FooCall::class, 'fooFunction'])->everyMinute();
 
         $this->schedule->call(fn () => '')->everyMinute();
         $closureLineNumber = __LINE__ - 1;
@@ -49,6 +51,8 @@ public function testDisplaySchedule()
             ->expectsOutput('  * *     * *      *  Illuminate\Tests\Integration\Console\Scheduling\FooJob  Next Due: 1 minute from now')
             ->expectsOutput('  0 9,17  * *      *  php artisan inspire ......... Next Due: 9 hours from now')
             ->expectsOutput('  0 10    * *      *  php artisan inspire ........ Next Due: 10 hours from now')
+            ->expectsOutput('  * *     * *      *  Closure at: Illuminate\Tests\Integration\Console\Scheduling\FooCall  Next Due: 1 minute from now')
+            ->expectsOutput('  * *     * *      *  Closure at: Illuminate\Tests\Integration\Console\Scheduling\FooCall::fooFunction  Next Due: 1 minute from now')
             ->expectsOutput('  * *     * *      *  Closure at: '.$closureFilePath.':'.$closureLineNumber.'  Next Due: 1 minute from now');
     }
 
@@ -60,6 +64,8 @@ public function testDisplayScheduleWithSort()
         $this->schedule->job(FooJob::class)->everyMinute();
         $this->schedule->command('inspire')->cron('0 9,17 * * *');
         $this->schedule->command('inspire')->cron("0 10\t* * *");
+        $this->schedule->call(FooCall::class)->everyMinute();
+        $this->schedule->call([FooCall::class, 'fooFunction'])->everyMinute();
 
         $this->schedule->call(fn () => '')->everyMinute();
         $closureLineNumber = __LINE__ - 1;
@@ -69,6 +75,8 @@ public function testDisplayScheduleWithSort()
             ->assertSuccessful()
             ->expectsOutput('  * *     * *      *  php artisan foobar a='.ProcessUtils::escapeArgument('b').' ... Next Due: 1 minute from now')
             ->expectsOutput('  * *     * *      *  Illuminate\Tests\Integration\Console\Scheduling\FooJob  Next Due: 1 minute from now')
+            ->expectsOutput('  * *     * *      *  Closure at: Illuminate\Tests\Integration\Console\Scheduling\FooCall  Next Due: 1 minute from now')
+            ->expectsOutput('  * *     * *      *  Closure at: Illuminate\Tests\Integration\Console\Scheduling\FooCall::fooFunction  Next Due: 1 minute from now')
             ->expectsOutput('  * *     * *      *  Closure at: '.$closureFilePath.':'.$closureLineNumber.'  Next Due: 1 minute from now')
             ->expectsOutput('  0 9,17  * *      *  php artisan inspire ......... Next Due: 9 hours from now')
             ->expectsOutput('  0 10    * *      *  php artisan inspire ........ Next Due: 10 hours from now')
@@ -106,3 +114,14 @@ class FooCommand extends Command
 class FooJob
 {
 }
+
+class FooCall
+{
+    public function __invoke(): void
+    {
+    }
+
+    public function fooFunction(): void
+    {
+    }
+}