fix(react): setup-ssr generator should infer bundler based on the exe…

…cutor for build #28128 (#28217)

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## Current Behavior
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`@nx/react:setup-ssr` defaults to webpack which causes issues when the
`react` app is already using rspack.



## Expected Behavior
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-->
Infer bundler based on the `build` target

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

Fixes #28128

packages/react/src/generators/setup-ssr/setup-ssr.ts

@@ -124,6 +124,12 @@ export async function setupSsrGenerator(tree: Tree, options: Schema) {
     );
   }
 
+  if (projectConfig.targets.build.executor === '@nx/rspack:rspack') {
+    options.bundler = 'rspack';
+  } else if (projectConfig.targets.build.executor === '@nx/webpack:webpack') {
+    options.bundler = 'webpack';
+  }
+
   projectConfig.targets = {
     ...projectConfig.targets,
     server: {