Add assert in test live component

[Arkalo2]

Q	A
Bug fix?	no
New feature?	yes
Docs?	yes
Issues	no
License	MIT

This MR simplify liveComponent event testing :
Actually with the Test Helper, we can't simply test whether an event has been dispatched from a component.
This PR add 2 asserts :

$this->componentHasEmittedEvent($render, 'event-name', [
    'eventArg1' => $eventArg1,
]);

$this->assertComponentNotEmitEvent($render, 'event-name');