feat(react-native): name UIKit views and surface callback errors

[DjDeveloperr]

Generated by Codex.

What changed

• Adds name / debugName support to defineUIKitView() and forwards the selected value to the shared RN host view for native debug descriptions.
• Documents that the RN host component tag remains NativeScriptUIView while the native description can include the plugin-defined name.
• Captures JS errors thrown from JSI-backed Objective-C block callbacks inside the libffi trampoline and rethrows them as JSI errors after the native invocation unwinds.
• Adds regression coverage for JS errors thrown from ObjC block callbacks, plus RN fixture coverage that the UIKit host debug name is visible.

Validation

• npm run test-rn-ffi
• npm run test:macos
• npm run check:ffi-boundaries
• git diff --check
• node --check scripts/run-tests-macos.js
• node --check scripts/run-tests-ios.js

After this PR lands and main CI is green, I will trigger the next 9.0.0-preview.* trusted-publisher releases for all iOS engines plus @nativescript/react-native.

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