Issue #2333353 by ashutoshsngh: Remove usage of form_get_errors().

core/lib/Drupal/Core/Block/BlockBase.php

core/lib/Drupal/Core/Form/FormBuilderInterface.php

core/modules/comment/comment.module

core/modules/datetime/datetime.module

core/modules/editor/src/Form/EditorImageDialog.php

core/modules/editor/src/Form/EditorLinkDialog.php

core/modules/node/src/NodeForm.php

...modules/system/src/Tests/Form/ElementsTableSelectTest.php

core/modules/system/src/Tests/Form/FormTest.php

core/modules/system/src/Tests/Form/ProgrammaticTest.php

...ules/system/src/Tests/System/SystemConfigFormTestBase.php

core/modules/taxonomy/src/Form/OverviewTerms.php

core/modules/views_ui/src/Form/Ajax/ConfigHandler.php

core/modules/views_ui/src/Form/Ajax/Display.php