Issue #2031881 by plopesc: Move block_test_views() to tests/modules folder.

...odules/block/tests/modules/block_test/block_test.info.yml

.../modules/block/tests/modules/block_test/block_test.module

...odules/block_test/config/block.block.stark.test_block.yml

...Drupal/block_test/Plugin/Block/TestBlockInstantiation.php

...est/lib/Drupal/block_test/Plugin/Block/TestCacheBlock.php

...st/lib/Drupal/block_test/Plugin/Block/TestHtmlIdBlock.php

.../lib/Drupal/block_test/Plugin/Block/TestXSSTitleBlock.php

...ck_test/themes/block_test_theme/block_test_theme.info.yml

.../tests/modules/block_test_views/block_test_views.info.yml

...ck/tests/modules/block_test_views/block_test_views.module

...lock_test_views/test_views/views.view.test_view_block.yml

...ock_test_views/test_views/views.view.test_view_block2.yml