#3507554 "Render failure event dispatching"

• New pattern render failure event for subscribers: \Drupal\patternkit\PatternkitEvents::RENDER_FAILURE
• New event subscriber reacting to the render failure event and handling replacement of the pattern_error render element: \Drupal\patternkit\EventSubscriber\RenderFailureErrorDisplaySubscriber
• New event is dispatched from within the pattern render element when an exception is encountered

added 1 commit

• 58417462 - Fix unit test not parsing translatable markup object.

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added 1 commit

• 40a6d5a2 - Add handling for missing #pattern values.

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added 1 commit

• 648ece59 - Catch all throwable exceptions during rendering.

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added 1 commit

• 2484f76f - Elevate captured exceptions to Throwable to capture errors as well.

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merged