Using GREYHostApplicationDistantObject with CocoaPods Setup

I've setup EG2 using CocoaPods, and ensured the base functionality works. I then followed the instructions for the [whitebox setup.
](https://github.com/google/EarlGrey/blob/earlgrey2/docs/swift-white-boxing.md)

When attempting to interact with the target app, I get the following error: `caught "NSInvalidArgumentException", "*** -[NSProxy doesNotRecognizeSelector:] called!"`

With the CocoaPods setup, do I need to create the helper bundle, and add all of the linking as specified in the other instructions? Could someone add some clarity around this?

Start with docs/swift-white-boxing.md and compare its helper-bundle and linking instructions with the CocoaPods setup described in the issue. Reproduce the NSProxy error if possible, then clarify whether those steps are required for CocoaPods and update the setup guidance accordingly.

Written by the indexing model from the issue text.