Issue #2902529 by mfernea: Fix 'Drupal.WhiteSpace.EmptyLines' coding standard

core/includes/file.inc

core/lib/Drupal/Component/Datetime/DateTimePlus.php

.../src/Functional/EntityResource/EntityResourceTestBase.php

core/modules/simpletest/src/KernelTestBase.php

...modules/views/src/Plugin/views/filter/BooleanOperator.php

...odules/views/src/Plugin/views/filter/FilterPluginBase.php

core/phpcs.xml.dist

core/tests/Drupal/Tests/Core/Access/AccessResultTest.php