fix(material/select): breaking changes for v20

Removes the deprecated symbols for v20 from the select.

BREAKING CHANGE:
* `matSelectAnimations.transformPanelWrap` has been removed.

Author: crisbeto

src/material/select/select-animations.ts

@@ -16,42 +16,8 @@
  * @breaking-change 21.0.0
  */
 export const matSelectAnimations: {
-  /**
-   * @deprecated No longer being used. To be removed.
-   * @breaking-change 12.0.0
-   */
-  readonly transformPanelWrap: any;
   readonly transformPanel: any;
 } = {
-  // Represents
-  // trigger('transformPanelWrap', [
-  //   transition('* => void', query('@transformPanel', [animateChild()], {optional: true})),
-  // ])
-
-  /**
-   * This animation ensures the select's overlay panel animation (transformPanel) is called when
-   * closing the select.
-   * This is needed due to https://github.com/angular/angular/issues/23302
-   */
-  transformPanelWrap: {
-    type: 7,
-    name: 'transformPanelWrap',
-    definitions: [
-      {
-        type: 1,
-        expr: '* => void',
-        animation: {
-          type: 11,
-          selector: '@transformPanel',
-          animation: [{type: 9, options: null}],
-          options: {optional: true},
-        },
-        options: null,
-      },
-    ],
-    options: {},
-  },
-
   // Represents
   // trigger('transformPanel', [
   //   state(

tools/public_api_guard/material/select.md

@@ -218,7 +218,6 @@ export class MatSelect implements AfterContentInit, OnChanges, OnDestroy, OnInit
 
 // @public @deprecated
 export const matSelectAnimations: {
-    readonly transformPanelWrap: any;
     readonly transformPanel: any;
 };