Issue #2901727 by iainp999, mfernea: Fix 'Drupal.Methods.MethodDeclaration' coding standard

...Drupal/Component/Annotation/Reflection/MockFileFinder.php

core/lib/Drupal/Component/Utility/Timer.php

core/lib/Drupal/Core/Config/Schema/ArrayElement.php

core/lib/Drupal/Core/Field/FieldUpdateActionBase.php

core/lib/Drupal/Core/FileTransfer/FileTransfer.php

...ib/Drupal/Core/ImageToolkit/ImageToolkitOperationBase.php

.../modules/editor/src/Plugin/Filter/EditorFileReference.php

...Plugin/migrate/destination/ComponentEntityDisplayBase.php

...es/migrate/src/Plugin/migrate/source/SourcePluginBase.php

core/modules/node/src/Plugin/Search/NodeSearch.php

...ystem/src/Tests/Cache/GenericCacheBackendUnitTestBase.php

core/modules/user/src/Plugin/Search/UserSearch.php

core/modules/views/src/Plugin/views/area/AreaPluginBase.php

core/phpcs.xml.dist

...ernelTests/Core/Cache/GenericCacheBackendUnitTestBase.php