fix(vite): respect existing package.json type #27057 (#27084)

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## Current Behavior
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The `@nx/vite:build` executor is always overwriting the
`packageJson.type` field when generating a packageJson.

## Expected Behavior
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The `@nx/vite:build` executor should respect the existing type in
packageJson

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

Fixes #27057

(cherry picked from commit db7cb5d)

packages/vite/src/executors/build/build.impl.ts

@@ -129,7 +129,7 @@ export async function* viteBuildExecutor(
       }
     );
 
-    builtPackageJson.type = 'module';
+    builtPackageJson.type ??= 'module';
 
     writeJsonFile(
       `${outDirRelativeToWorkspaceRoot}/package.json`,