Following a breaking change to the ImageStream API in the framework(#32936) the Google Maps plugin sample app needs to be updated to the new API.

As we make sure to keep plugins working agains stable we cannot apply the update before the framework change makes it to stable. But if we do not apply the change, the plugins' CI is red as it's running with master.

For now, I'm updating the sample app to the new framework API, but commenting out the "set marker icon" sample until the framework change makes it to master.

Once the framework change makes it to stable we should uncomment that code.