Animated: Delete getNode() on Refs

Summary:
In 0.62, `createAnimatedComponent` was changed to use `forwardRef` instead of requiring callers to use `ref.getNode()`. In order to preserve backward-compatibility, `ref.getNode()` was monkey-patched onto the returned ref, if possible, to return the `ref` and output a console warning.

Three major (well, technically, minor) releases later, we are dropping support for `getNode()`. Calling it on the `ref` of an animated component will begin to fail after this (unless the underlying component itself actually implements a `getNode()` method on its imperative handle).

Changelog:
[General][Removed] - Removed `getNode()` from animated component refs.

Reviewed By: nadiia

Differential Revision: D27979882

fbshipit-source-id: 885c3dbf4f2749c994fc2662dd6f16ff3dd887c7

Libraries/Animated/createAnimatedComponent.js

@@ -198,19 +198,6 @@ function createAnimatedComponent<Props: {+[string]: mixed, ...}, Instance>(
       setLocalRef: ref => {
         this._prevComponent = this._component;
         this._component = ref;
-
-        // TODO: Delete this in a future release.
-        if (ref != null && ref.getNode == null) {
-          ref.getNode = () => {
-            console.warn(
-              '%s: Calling `getNode()` on the ref of an Animated component ' +
-                'is no longer necessary. You can now directly use the ref ' +
-                'instead. This method will be removed in a future release.',
-              ref.constructor.name ?? '<<anonymous>>',
-            );
-            return ref;
-          };
-        }
       },
     });