Clean up findFiberByHostInstance from DevTools Hook (#31711)

The need for this was removed in
#30831

Since the new DevTools version has been released for a while and we
expect people to more or less auto-update. Future versions of React
don't need this.

Once we remove the remaining uses of `getInstanceFromNode` e.g. in the
deprecated internal `findDOMNode`/`findNodeHandle` and the event system,
we can completely remove the tagging of DOM nodes.

packages/react-reconciler/src/ReactFiberReconciler.js

@@ -42,7 +42,6 @@ import {enableSchedulingProfiler} from 'shared/ReactFeatureFlags';
 import ReactSharedInternals from 'shared/ReactSharedInternals';
 import {
   getPublicInstance,
-  getInstanceFromNode,
   rendererVersion,
   rendererPackageName,
   extraDevToolsConfig,
@@ -847,7 +846,6 @@ export function injectIntoDevTools(): boolean {
     version: rendererVersion,
     rendererPackageName: rendererPackageName,
     currentDispatcherRef: ReactSharedInternals,
-    findFiberByHostInstance: getInstanceFromNode,
     // Enables DevTools to detect reconciler version rather than renderer version
     // which may not match for third party renderers.
     reconcilerVersion: ReactVersion,