Issue #2150621 by damiankloip: Separate applies and build logic for breadcrumb builders.

...lib/Drupal/Core/Breadcrumb/BreadcrumbBuilderInterface.php

core/lib/Drupal/Core/Breadcrumb/BreadcrumbManager.php

core/modules/book/lib/Drupal/book/BookBreadcrumbBuilder.php

...s/comment/lib/Drupal/comment/CommentBreadcrumbBuilder.php

...modules/forum/lib/Drupal/forum/ForumBreadcrumbBuilder.php

...s/system/lib/Drupal/system/PathBasedBreadcrumbBuilder.php

...es/taxonomy/lib/Drupal/taxonomy/TermBreadcrumbBuilder.php

...ts/Drupal/Tests/Core/Breadcrumb/BreadcrumbManagerTest.php