chore: improve codegen error when native project not found (#53726)

Summary:
While working on a somewhat non-standard library setup I ran into:

`[Codegen] TypeError [ERR_INVALID_ARG_TYPE]: The "from" argument must be of type string. Received undefined`

which was caused by `xcodeproj` file not found. The issue was on the project side rather than codegen, but the error message was rather unhelpful, so this improves it.

## Changelog:

[General][Changed] - improve codegen error when ios native project not found

Pull Request resolved: #53726

Test Plan:
tested locally, received the improved error message:

`[Codegen] Error: Cannot find .xcodeproj file inside /Users/some_project. This is required to determine codegen spec paths relative to native project.`

Reviewed By: cortinico

Differential Revision: D82226931

Pulled By: cipolleschi

fbshipit-source-id: dd851205655048fc35ed9f5266cefdbfb067d211

Author: vonovak

packages/react-native/scripts/codegen/generate-artifacts-executor/generateReactCodegenPodspec.js

@@ -59,6 +59,11 @@ function getInputFiles(appPath /*: string */, appPkgJson /*: $FlowFixMe */) {
         !projectPath.includes('/Pods/') && // exclude Pods/Pods.xcodeproj
         !projectPath.includes('/node_modules/'), // exclude all the xcodeproj in node_modules of libraries
     )[0];
+  if (!xcodeproj) {
+    throw new Error(
+      `Cannot find .xcodeproj file inside ${appPath}. This is required to determine codegen spec paths relative to native project.`,
+    );
+  }
   const jsFiles = '-name "Native*.js" -or -name "*NativeComponent.js"';
   const tsFiles = '-name "Native*.ts" -or -name "*NativeComponent.ts"';
   const findCommand = `find ${path.join(appPath, jsSrcsDir)} -type f -not -path "*/__mocks__/*" -and \\( ${jsFiles} -or ${tsFiles} \\)`;