feat: simplify iOS metro URL passing

[jwajgelt]

Simplifies how the Metro server URL is passed to the application.
We make use of a mechanism of simctl where extra arguments for the launch command are passed to the application as UserDefaults entries, which is how react-native gets the JS bundle URL.

How Has This Been Tested:

• open react-native-(75-83) apps in Radon on iOS simulator
• if the app was previously installed, use the "Reinstall App" reload option to clear the existing UserDefaults entries created by Radon before this change
• verify the app loads and connects to Metro
• [BONUS POINTS] -- you can check that the option is not persistent by opening the App Switcher, killing the app and restarting it from Springboard -- the Application should fail to fetch the bundle now

How Has This Change Been Documented:

INTERNAL

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Project	Deployment	Review	Updated (UTC)
radon-ide	Ready	Preview, Comment	Dec 18, 2025 11:22am

[kmagiera]