Refactor workflow classes and forms

- the workflow controller add a context to each transition;
- the state of the entity workflow is applyied using a dedicated marking store
- the method EntityWorkflow::step use the context to associate the new step with the future destination user, cc users and email. This makes the step consistent at every step.
- this allow to remove some logic which was processed in eventSubscribers,
- as counterpart, each workflow must specify a dedicated marking_store:

```yaml
framework:
    workflows:
        vendee_internal:
            # ...
            marking_store:
                service: Chill\MainBundle\Workflow\EntityWorkflowMarkingStore
```

src/Bundle/ChillMainBundle/Workflow/WorkflowTransitionContextDTO.php

@@ -0,0 +1,74 @@
+<?php
+
+declare(strict_types=1);
+
+/*
+ * Chill is a software for social workers
+ *
+ * For the full copyright and license information, please view
+ * the LICENSE file that was distributed with this source code.
+ */
+
+namespace Chill\MainBundle\Workflow;
+
+use Chill\MainBundle\Entity\User;
+use Chill\MainBundle\Entity\Workflow\EntityWorkflow;
+use Symfony\Component\Validator\Constraints as Assert;
+use Symfony\Component\Validator\Context\ExecutionContextInterface;
+use Symfony\Component\Workflow\Transition;
+
+/**
+ * Context for a transition on an workflow entity.
+ */
+class WorkflowTransitionContextDTO
+{
+    /**
+     * a list of future dest users for the next steps.
+     *
+     * This is in used in order to let controller inform who will be the future users which will validate
+     * the next step. This is necessary to perform some computation about the next users, before they are
+     * associated to the entity EntityWorkflowStep.
+     *
+     * @var array|User[]
+     */
+    public array $futureDestUsers = [];
+
+    /**
+     * a list of future cc users for the next steps.
+     *
+     * @var array|User[]
+     */
+    public array $futureCcUsers = [];
+
+    /**
+     * a list of future dest emails for the next steps.
+     *
+     * This is in used in order to let controller inform who will be the future emails which will validate
+     * the next step. This is necessary to perform some computation about the next emails, before they are
+     * associated to the entity EntityWorkflowStep.
+     *
+     * @var array|string[]
+     */
+    public array $futureDestEmails = [];
+
+    public ?Transition $transition = null;
+
+    public string $comment = '';
+
+    public function __construct(
+        public EntityWorkflow $entityWorkflow
+    ) {}
+
+    #[Assert\Callback()]
+    public function validateCCUserIsNotInDest(ExecutionContextInterface $context, $payload): void
+    {
+        foreach ($this->futureDestUsers as $u) {
+            if (in_array($u, $this->futureCcUsers, true)) {
+                $context
+                    ->buildViolation('workflow.The user in cc cannot be a dest user in the same workflow step')
+                    ->atPath('ccUsers')
+                    ->addViolation();
+            }
+        }
+    }
+}