bug symfony#23299 [Workflow] Added more events to the announce function (Nyholm)

This PR was submitted for the master branch but it was merged into the 3.2 branch instead (closes symfony#23299).

Discussion
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[Workflow] Added more events to the announce function

| Q             | A
| ------------- | ---
| Branch?       | 3.2
| Bug fix?      | yes/no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | symfony#23275
| License       | MIT
| Doc PR        | symfony#8087

This PR will fix symfony#23275

The documentation states that we dispatch events `workflow.announce` and `workflow.[name].announce`. It was me who wrongly added it to the docs... sorry about that.

We could either: Change the docs or add these events. I choose to add these event to the source since the same events are dispatched for "guard", "leave", "transition", "enter" and "entered".

Commits
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c5042f3 [Workflow] Added more events to the announce function

Author: lyrixx

src/Symfony/Component/Workflow/Tests/WorkflowTest.php

@@ -259,6 +259,8 @@ public function testApplyWithEventDispatcher()
             'workflow.workflow_name.enter.b',
             'workflow.workflow_name.enter.c',
             // Following events are fired because of announce() method
+            'workflow.announce',
+            'workflow.workflow_name.announce',
             'workflow.guard',
             'workflow.workflow_name.guard',
             'workflow.workflow_name.guard.t2',

src/Symfony/Component/Workflow/Workflow.php

@@ -282,6 +282,9 @@ private function announce($subject, Transition $initialTransition, Marking $mark
 
         $event = new Event($subject, $marking, $initialTransition);
 
+        $this->dispatcher->dispatch('workflow.announce', $event);
+        $this->dispatcher->dispatch(sprintf('workflow.%s.announce', $this->name), $event);
+
         foreach ($this->getEnabledTransitions($subject) as $transition) {
             $this->dispatcher->dispatch(sprintf('workflow.%s.announce.%s', $this->name, $transition->getName()), $event);
         }