Issue #2401505 by Berdir, jibran, larowlan: Add an entity collection template for lists

core/lib/Drupal/Core/Entity/Entity.php

core/lib/Drupal/Core/Utility/LinkGeneratorInterface.php

core/modules/action/action.info.yml

core/modules/action/action.links.menu.yml

core/modules/action/action.links.task.yml

core/modules/action/action.module

core/modules/action/action.routing.yml

core/modules/action/src/ActionFormBase.php

core/modules/action/src/Form/ActionDeleteForm.php

...dules/action/tests/src/Unit/Menu/ActionLocalTasksTest.php

core/modules/block_content/block_content.info.yml

core/modules/block_content/block_content.links.action.yml

core/modules/block_content/block_content.links.task.yml

core/modules/block_content/block_content.module

core/modules/block_content/block_content.routing.yml

core/modules/block_content/src/BlockContentForm.php

core/modules/block_content/src/BlockContentTypeForm.php

core/modules/block_content/src/Entity/BlockContent.php

core/modules/block_content/src/Entity/BlockContentType.php

...modules/block_content/src/Form/BlockContentDeleteForm.php