Parent class implements ContainerFactoryPluginInterface, so it's not necessary for its child classes to repeat that they do as well

Problem/Motivation

class DateTimeDefaultWidget extends DateTimeWidgetBase implements ContainerFactoryPluginInterface {

and DateTimeWidgetBase class extends WidgetBase class

class DateTimeWidgetBase extends WidgetBase {

and , WidgetBase class implements ContainerFactoryPluginInterface

abstract class WidgetBase extends PluginSettingsBase implements WidgetInterface, ContainerFactoryPluginInterface {

Proposed resolution

Remove redundant ContainerFactoryPluginInterface from child classes