[core] fix ExpoRequestInterceptorProtocol leakage

[Kudo]

Why

fixes #29561

How

create a shared URLSession to prevent memory leak

Test Plan

test network inspector in bare-expo

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: 5ebe039

Fingerprint diff

[
  {
    "type": "dir",
    "filePath": "../../packages/expo-modules-core",
    "reasons": [
      "expoAutolinkingIos",
      "expoAutolinkingAndroid"
    ],
    "hash": "34ed95b8d64dab36cfdabc9219ea309363e421a0"
  }
]

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