fix ContainerAwareEventDispatcher definition
bug #4240 [Components][EventDispatcher] fix ContainerAwareEventDispatcher definition (xabbuh)

This PR was merged into the 2.3 branch.

Discussion
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[Components][EventDispatcher] fix ContainerAwareEventDispatcher definition

| Q             | A
| ------------- | ---
| Doc fix?      | yes
| New docs?     | no
| Applies to    | all
| Fixed tickets | #4235

Commits
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4742859 fix ContainerAwareEventDispatcher definition