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/ChillPersonBundle/Workflow/AccompanyingPeriodWorkEvaluationDocumentWorkflowHandler.php

@@ -123,9 +123,4 @@ class AccompanyingPeriodWorkEvaluationDocumentWorkflowHandler implements EntityW
     {
         return AccompanyingPeriodWorkEvaluationDocument::class === $entityWorkflow->getRelatedEntityClass();
     }
-
-    public function supportsFreeze(EntityWorkflow $entityWorkflow, array $options = []): bool
-    {
-        return false;
-    }
 }

src/Bundle/ChillPersonBundle/Workflow/AccompanyingPeriodWorkEvaluationWorkflowHandler.php

@@ -109,9 +109,4 @@ class AccompanyingPeriodWorkEvaluationWorkflowHandler implements EntityWorkflowH
     {
         return AccompanyingPeriodWorkEvaluation::class === $entityWorkflow->getRelatedEntityClass();
     }
-
-    public function supportsFreeze(EntityWorkflow $entityWorkflow, array $options = []): bool
-    {
-        return false;
-    }
 }

src/Bundle/ChillPersonBundle/Workflow/AccompanyingPeriodWorkWorkflowHandler.php

@@ -116,9 +116,4 @@ class AccompanyingPeriodWorkWorkflowHandler implements EntityWorkflowHandlerInte
     {
         return AccompanyingPeriodWork::class === $entityWorkflow->getRelatedEntityClass();
     }
-
-    public function supportsFreeze(EntityWorkflow $entityWorkflow, array $options = []): bool
-    {
-        return false;
-    }
 }