RNSession: Fix the decidePolicyFor handler
#225
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Summary
This PR fixes the navigation policy handler after upgrading to Hotwire Native iOS 1.2
In particular, we now implement the same policies as Hotwire Native and call the RN method correctly, letting that handle the actual opening of external URLs (by cancelling the request).
It also removes the unused delegate method from Turbo Native iOS which doesn't exist in Hotwire Native.
Test plan
Can be tested by tapping an external link or a link that requests a blank window.
Also tested on a page that contains an iframe (which previously would trigger the RN-side method) and confirm that it doesn't.