fix(material-experimental/mdc-form-field): missing animation styles due to rebase conflict

b24b9e3 accidentally removed the form-field animation
styles due to a rebase conflict. This commit re-adds the animation styles.

Author: devversion

src/material-experimental/mdc-form-field/form-field.scss

@@ -53,3 +53,12 @@
   min-height: $mdc-text-field-height;
   box-sizing: border-box;
 }
+
+// In order to make it possible for developers to disable animations for form-fields,
+// we only activate the animation styles if animations are not explicitly disabled.
+.mat-mdc-form-field:not(.mat-form-field-no-animations) {
+  @include mdc-notched-outline-core-styles($query: animation);
+  @include mdc-floating-label-core-styles($query: animation);
+  @include mdc-text-field-core-styles($query: animation);
+  @include mdc-line-ripple-core-styles($query: animation);
+}