Return early prior to evaluation of prop expressions if the user does not have access to the reference entity
## Problem statement `\Drupal\canvas\Plugin\Canvas\ComponentSource\JsComponent::getExplicitInput` performs prop expression evaluation on entity reference props. Inside the prop evaluation access control is checked. However, we could do this in `\Drupal\canvas\Plugin\Canvas\ComponentSource\JsComponent::getExplicitInput` and return early, avoiding the overhead of the evaluation. ## Proposed resolution Access check the referenced entity with `->access('view')` in `\Drupal\canvas\Plugin\Canvas\ComponentSource\JsComponent::getExplicitInput` and if it returns FALSE, return early.
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