Issue #2029733 by damiankloip, tim.plunkett: Add a getExecutable() method to View.

...odules/views/lib/Drupal/views/Plugin/Core/Entity/View.php

...s/views/lib/Drupal/views/Plugin/Derivative/ViewsBlock.php

...rupal/views/Plugin/Derivative/ViewsExposedFilterBlock.php

...dules/views/lib/Drupal/views/Plugin/views/HandlerBase.php

...lib/Drupal/views/Plugin/views/filter/FilterPluginBase.php

...b/Drupal/views/Plugin/views/relationship/GroupwiseMax.php

...views/lib/Drupal/views/Plugin/views/row/RowPluginBase.php

...lib/Drupal/views/Plugin/views/wizard/WizardPluginBase.php

...modules/views/lib/Drupal/views/Tests/DefaultViewsTest.php

...s/views/lib/Drupal/views/Tests/Handler/HandlerAllTest.php

core/modules/views/lib/Drupal/views/Tests/ModuleTest.php

.../modules/views/lib/Drupal/views/Tests/ViewStorageTest.php

core/modules/views/lib/Drupal/views/ViewExecutable.php

core/modules/views/views.module

core/modules/views_ui/admin.inc

...s_ui/lib/Drupal/views_ui/Controller/ViewsUIController.php

...odules/views_ui/lib/Drupal/views_ui/Form/Ajax/AddItem.php

...odules/views_ui/lib/Drupal/views_ui/Form/Ajax/Analyze.php

...les/views_ui/lib/Drupal/views_ui/Form/Ajax/ConfigItem.php

...iews_ui/lib/Drupal/views_ui/Form/Ajax/ConfigItemExtra.php