refactor!: remove vaadin-date-picker-light element (#9167)

Author: web-padawan

packages/date-picker/src/vaadin-date-picker-light.d.ts

@@ -397,17 +397,6 @@ export const DatePickerMixin = (subclass) =>
       this.__setEnteredDate(parsedDate);
     }
 
-    /**
-     * Override a getter from `InputControlMixin` to make it optional
-     * and to prevent warning when a clear button is missing,
-     * for example when using <vaadin-date-picker-light>.
-     * @protected
-     * @return {Element | null | undefined}
-     */
-    get clearElement() {
-      return null;
-    }
-
     /** @private */
     get _nativeInput() {
       if (this.inputElement) {

packages/date-picker/src/vaadin-date-picker-light.js

@@ -93,9 +93,6 @@ export interface DatePickerEventMap extends HTMLElementEventMap, DatePickerCusto
  * -----------|--------------------------------------------------|-----------
  * `opened`   | Set when the date selector overlay is opened     | :host
  *
- * If you want to replace the default `<input>` and its container with a custom implementation to get full control
- * over the input field, consider using the [`<vaadin-date-picker-light>`](#/elements/vaadin-date-picker-light) element.
- *
  * ### Internal components
  *
  * In addition to `<vaadin-date-picker>` itself, the following internal

packages/date-picker/src/vaadin-date-picker-mixin.js

@@ -56,9 +56,6 @@ registerStyles('vaadin-date-picker', [inputFieldShared, datePickerStyles], { mod
  * -----------|--------------------------------------------------|-----------
  * `opened`   | Set when the date selector overlay is opened     | :host
  *
- * If you want to replace the default `<input>` and its container with a custom implementation to get full control
- * over the input field, consider using the [`<vaadin-date-picker-light>`](#/elements/vaadin-date-picker-light) element.
- *
  * ### Internal components
  *
  * In addition to `<vaadin-date-picker>` itself, the following internal