[core][av] fix error on new architecture mode

[Kudo]

Why

fixes #29996

How

it's a regression from #28829

• [core] fix addUIBlock and executeUIBlock crash on new architecture mode. we don't have to access content subview after my changes.
• [av] Video is broken because the legacy EXVideoView is not an ExpoFabricView and doesn't receive prop updates. it was working because we had the view wrapper. this pr tries to add an ExpoVideoView to contain the subview. that is to simulate the working state before my change

Test Plan

• bare-expo video test
• fabric-tester video test

Checklist

• Documentation is up to date to reflect these changes (eg: https://docs.expo.dev and README.md).
• Conforms with the Documentation Writing Style Guide
• This diff will work correctly for npx expo prebuild & EAS Build (eg: updated a module plugin).

[expo-bot]

The Pull Request introduced fingerprint changes against the base commit: e3b9790

Fingerprint diff

[
  {
    "type": "dir",
    "filePath": "../../packages/expo-av/ios",
    "reasons": [
      "expoAutolinkingIos"
    ],
    "hash": "5211595e6d8409bd7ca70c3b0e833dd7bd95975d"
  },
  {
    "type": "dir",
    "filePath": "../../packages/expo-modules-core",
    "reasons": [
      "expoAutolinkingIos",
      "expoAutolinkingAndroid"
    ],
    "hash": "9f81b81d93f522d385efb5f3ef11a62ae97e1abb"
  }
]

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