[0.68] Deprecate onScrollKeyDown, refactor Flatlist selection logic

[Saadnajmi]

Please select one of the following

• I am removing an existing difference between facebook/react-native and microsoft/react-native-macos 👍
• I am cherry-picking a change from Facebook's react-native into microsoft/react-native-macos 👍
• I am making a fix / change for the macOS implementation of react-native
• I am making a change required for Microsoft usage of react-native

Summary

Cherry pick #1338 and #1365 to 0.68-stable

Changelog

[macOS] [Fixed] - Deprecate onScrollKeyDown

[pull-bot]

	Fails
🚫	node failed.

	Messages
📖	📋 Missing Test Plan - Can you add a Test Plan? To do so, add a "## Test Plan" section to your PR description. A Test Plan lets us know how these changes were tested.

Log

Error:  RequestError [HttpError]: Must have admin rights to Repository.
    at /root/react-native/bots/node_modules/@octokit/request/dist-node/index.js:86:21
    at processTicksAndRejections (internal/process/task_queues.js:95:5) {
  status: 403,
  response: {
    url: 'https://github.com/api/repos/microsoft/react-native-macos/issues/1374/labels',
    status: 403,
    headers: {
      'access-control-allow-origin': '*',
      'access-control-expose-headers': 'ETag, Link, Location, Retry-After, X-GitHub-OTP, X-RateLimit-Limit, X-RateLimit-Remaining, X-RateLimit-Used, X-RateLimit-Resource, X-RateLimit-Reset, X-OAuth-Scopes, X-Accepted-OAuth-Scopes, X-Poll-Interval, X-GitHub-Media-Type, X-GitHub-SSO, X-GitHub-Request-Id, Deprecation, Sunset',
      connection: 'close',
      'content-encoding': 'gzip',
      'content-security-policy': "default-src 'none'",
      'content-type': 'application/json; charset=utf-8',
      date: 'Thu, 25 Aug 2022 20:51:15 GMT',
      'referrer-policy': 'origin-when-cross-origin, strict-origin-when-cross-origin',
      server: 'GitHub.com',
      'strict-transport-security': 'max-age=31536000; includeSubdomains; preload',
      'transfer-encoding': 'chunked',
      vary: 'Accept-Encoding, Accept, X-Requested-With',
      'x-accepted-oauth-scopes': '',
      'x-content-type-options': 'nosniff',
      'x-frame-options': 'deny',
      'x-github-media-type': 'github.v3; format=json',
      'x-github-request-id': '84B6:3210:2CF73D:7CD6D8:6307E0C3',
      'x-oauth-scopes': 'public_repo',
      'x-ratelimit-limit': '5000',
      'x-ratelimit-remaining': '4925',
      'x-ratelimit-reset': '1661462995',
      'x-ratelimit-resource': 'core',
      'x-ratelimit-used': '75',
      'x-xss-protection': '0'
    },
    data: {
      message: 'Must have admin rights to Repository.',
      documentation_url: 'https://docs.github.com/rest/reference/issues#add-labels-to-an-issue'
    }
  },
  request: {
    method: 'POST',
    url: 'https://github.com/api/repos/microsoft/react-native-macos/issues/1374/labels',
    headers: {
      accept: 'application/vnd.github.v3+json',
      'user-agent': 'octokit-rest.js/18.12.0 octokit-core.js/3.5.1 Node.js/14.18.1 (linux; x64)',
      authorization: 'token [REDACTED]',
      'content-type': 'application/json; charset=utf-8'
    },
    body: '{"labels":["Pick Request"]}',
    request: { hook: [Function: bound bound register] }
  }
}
danger-results://tmp/danger-results.json

Generated by 🚫 dangerJS against 6448608