Only apply CORS to /backends in Functions emulator #4295
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Description
When adding the /backends route to the Functions emulator, we enabled CORS so that the Emulator UI could call the new endpoint. However, we did so too broadly, and caused some unexpected behavior changes (like #4294 ). This instead only applies CORS to just the /backends route.
I also noticed that we were unnecessarily using 'dataMiddleware' for this route, so I removed that.
Fixes #4294