[Workflow] Fix code blocks using an enum

[MatTheCat]

Follow-up of #21386 (comment)

[stof]

is this really needed ? The Yaml code snippet uses the enum case, not the value.

[MatTheCat]

The PHP config would support an enum, but not in an array. Since arrays are used everywhere else I preferred to keep consistency.

[nicolas-grekas]

This fails with

The following keys are not supported by "Symfony\Config\Framework\Workflows\WorkflowConfig\TransitionConfig\FromConfig": 0 in .../config/packages/workflow.php.

My advice: the array-shape format is way more flexible: it allows to diverge from the shape and still have normalizers make it work. (Which means we can also improve the shape-generator independently)

[nicolas-grekas]

We could also take this as an opportunity to improve the config generators, so that eg enums are accepted in the place() method. Lists accepted from ->from(). But I don't know if we'd have enough info in the config tree to know about this.
The array-shape format looks the best way to overcome this wall.

[nicolas-grekas]

all the block works this way

    $blogPublishing->transition()
        ->name('to_review')
            ->from(BlogPostStatus::Draft)
            ->to(BlogPostStatus::Reviewed);

    $blogPublishing->transition()
        ->name('publish')
            ->from(BlogPostStatus::Reviewed)
            ->to(BlogPostStatus::Published);

    $blogPublishing->transition()
        ->name('reject')
            ->from(BlogPostStatus::Reviewed)
            ->to(BlogPostStatus::Rejected);

[nicolas-grekas]

Related: symfony/symfony#62082, to allow enums in ->from(['place' => Enum::Case])

[stof]

this is not the equivalent of the Yaml code snippet, which references the enum itself instead of registering each case separately.

The equivalent of the Yaml snippet would be BlogPostStatus::class

[MatTheCat]

AFAIU there is no equivalent to the YAML syntax using PHP.

Passing BlogPostStatus::class to place would create a place named as the class.

[nicolas-grekas]

@MatTheCat is right, there's no equivalent using the fluent PHP-DSL

[nicolas-grekas]

Ah, wait, this works: $blogPublishing->place(BlogPostStatus::class.'::*');

[MatTheCat]

Not sure why initial-marking is in a sequence; I moved it so that the XML is valid.