fix(material/form-field): remove deprecated animation definitions

Deletes publicly-exported animation definitions that were marked for removal in v21.

BREAKING CHANGE:
* `matFormFieldAnimations` symbol has been removed.

Author: crisbeto

goldens/material/form-field/index.api.md

@@ -144,11 +144,6 @@ export class MatFormField implements FloatingLabelParent, AfterContentInit, Afte
     static ɵfac: i0.ɵɵFactoryDeclaration<MatFormField, never>;
 }
 
-// @public @deprecated
-export const matFormFieldAnimations: {
-    readonly transitionMessages: any;
-};
-
 // @public
 export type MatFormFieldAppearance = 'fill' | 'outline';
 

src/material/form-field/BUILD.bazel

@@ -99,7 +99,6 @@ ng_project(
     name = "form-field",
     srcs = [
         "form-field.ts",
-        "form-field-animations.ts",
         "form-field-control.ts",
         "form-field-errors.ts",
         "form-field-module.ts",

src/material/form-field/form-field-animations.ts

@@ -15,4 +15,3 @@ export * from './form-field';
 export * from './form-field-module';
 export * from './form-field-control';
 export * from './form-field-errors';
-export * from './form-field-animations';