chore(dangerfile): Auto-label pull requests opened against release branches (#32917)
chore(dangerfile): Auto-label pull requests opened against release branches (#32917)

Summary:
## Summary

Update dangerfile in order auto-label pull requests opened against release branches

Closes https://github.com/facebook/react-native/issues/32692

## Changelog

<!-- Help reviewers and the release process by writing your own changelog entry. For an example, see:
https://github.com/facebook/react-native/wiki/Changelog
-->

[Internal] [Added] -  Auto-label pull requests opened against release branches

Pull Request resolved: https://github.com/facebook/react-native/pull/32917

Test Plan:
As I don't have admin rights to this repo I tested this script on [a PR in my fork](https://github.com/gabrieldonadel/react-native/pull/1) by running

```
 yarn danger pr https://github.com/gabrieldonadel/react-native/pull/1
```

https://user-images.githubusercontent.com/11707729/150026370-4cce7831-c4ee-4269-b6a8-646f965826c5.mov

As you can see in the video once I run the script it automatically adds the label

Reviewed By: lunaleaps

Differential Revision: D33647174

Pulled By: yungsters

fbshipit-source-id: a7e7cab458b4cb7ff2cf318c4df1e9fb5d91a9f7

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