fix(react): depends on migration should ignore configs that point to …

…@nx/react nrwl#28377 (nrwl#28382)

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## Current Behavior
<!-- This is the behavior we have today -->
Some executors using `@nx/webpack:webpack` point to a webpack config
that is exported from the `@nx/react plugin.

We do not want to try modify this.


## Expected Behavior
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-->
Skip the migration if the webpack config points to the exported plugin
from @nx/react.


## Related Issue(s)
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merged. -->

Fixes nrwl#28377

packages/react/src/migrations/update-19-6-1/ensure-depends-on-for-mf.ts

@@ -9,7 +9,7 @@ export default async function (tree: Tree) {
     '@nx/webpack:webpack',
     (options, projectName, targetName) => {
       const webpackConfig: string = options.webpackConfig;
-      if (!webpackConfig) {
+      if (!webpackConfig || webpackConfig === '@nx/react/plugins/webpack') {
         return;
       }