Issue 19: Ensure Drupal 11 compatibility for event subscribers. Replace direct...

Sergey Drakrequested to merge
issue/myrest-3593690:3593690-ensure-drupal-11 into 1.0.x

Issue 19: Ensure Drupal 11 compatibility for event subscribers. Replace direct response send() and exit calls with Event::setResponse().

Closes #3593690

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