Update debugger-frontend from 35c4630...51a91a2

Summary:
Changelog: [Internal] - Update `react-native/debugger-frontend` from 35c4630...51a91a2

Resyncs `react-native/debugger-frontend` from GitHub - see `rn-chrome-devtools-frontend` [changelog](https://github.com/facebook/react-native-devtools-frontend/compare/35c4630bd58bbcbc6f4c54c084b4e52994dc4940...51a91a2ad62e7f585912ed314a350a72de84d6ed).

### Changelog

| Commit | Author | Date/Time | Subject |
| ------ | ------ | --------- | ------- |
| [51a91a2ad](https://github.com/facebook/react-native-devtools-frontend/commit/51a91a2ad) | Ruslan Lesiutin (28902667+hoxyq@users.noreply.github.com) | 2025-07-04T14:04:02+01:00 | [bump: react-devtools@6.1.4 (#189)](https://github.com/facebook/react-native-devtools-frontend/commit/51a91a2ad) |
| [761b96907](https://github.com/facebook/react-native-devtools-frontend/commit/761b96907) | Vitali Zaidman (vzaidman@gmail.com) | 2025-07-04T12:55:39+01:00 | [fixed missing new line before string error causes (#186)](https://github.com/facebook/react-native-devtools-frontend/commit/761b96907) |
| [7774c38db](https://github.com/facebook/react-native-devtools-frontend/commit/7774c38db) | Alex Hunt (hello@alexhunt.dev) | 2025-06-30T13:20:49+01:00 | [Disable request initiator panel in NetworkItemView (#185)](https://github.com/facebook/react-native-devtools-frontend/commit/7774c38db) |

Reviewed By: huntie

Differential Revision: D77795834

fbshipit-source-id: 3c30f8e87593687415538902734b09b3144b70a4