Issue #2387141 by Gábor Hojtsy: Missing field configuration schemas across core tests

core/modules/editor/src/Tests/EditorAdminTest.php

core/modules/editor/src/Tests/QuickEditIntegrationTest.php

...editor/tests/modules/config/schema/editor_test.schema.yml

.../editor/tests/modules/src/Plugin/Editor/UnicornEditor.php

...odules/entity_reference/src/Tests/Views/SelectionTest.php

core/modules/field/src/Tests/DisplayApiTest.php

...ules/field/src/Tests/FieldImportDeleteUninstallUiTest.php

core/modules/field/src/Tests/FormTest.php

core/modules/field/src/Tests/ShapeItemTest.php

.../modules/field/src/Tests/TestItemWithDependenciesTest.php

..._plugins_test/config/schema/field_plugins_test.schema.yml

...ts/modules/field_test/config/schema/field_test.schema.yml

core/modules/field_ui/src/Tests/EntityDisplayTest.php

core/modules/field_ui/src/Tests/EntityFormDisplayTest.php

core/modules/field_ui/src/Tests/ManageDisplayTest.php

core/modules/field_ui/src/Tests/ManageFieldsTest.php

core/modules/link/config/schema/link.schema.yml

...src/Plugin/Field/FieldFormatter/LinkSeparateFormatter.php

core/modules/link/src/Tests/LinkFieldTest.php

...Plugin/migrate/process/d6/FieldInstanceWidgetSettings.php